Earthquake Risk in Peru: What to Check Before Buying Property

Hazard, exposure, vulnerability: understanding earthquake risk

Before talking about buildings and districts, it helps to clarify four concepts that are often confused, but which do not mean the same thing.

Seismic hazard refers to the probability that an earthquake of a certain intensity will occur in a given region. Peru presents a high hazard along its entire coastline: that is a geological fact, unchanged from one building to the next.

Exposure refers to the presence of people, buildings and activity in the area concerned. Lima, with several million residents concentrated in a limited area, has very high exposure simply by virtue of being a large city.

Vulnerability measures a specific building's ability, or inability, to withstand ground motion. It is the only one of the four concepts that varies significantly from one building to another, sometimes even between two neighbouring buildings.

Earthquake risk, finally, results from the combination of these three factors. High hazard and strong exposure alone do not make a property dangerous: it is the vulnerability of the specific building, the one factor a buyer can actually act on, that makes the real difference.

Is Peru strongly exposed to earthquakes?

Peru sits on the Pacific Ring of Fire, at the point where the oceanic Nazca plate gradually slides beneath the continental South American plate. This process, known as subduction, is what drives Peru's seismicity: it builds up stress that is periodically released as earthquakes, sometimes of significant magnitude, along the entire coast.

This is why the Peruvian coast, from Tumbes to Tacna, is under continuous monitoring by the Instituto Geofísico del Perú (IGP), the national scientific body responsible for seismic observation and tracking tectonic activity.

Two distinctions are worth clarifying, since they come up frequently in discussions of the topic.

Magnitude versus felt intensity

Magnitude measures the energy released by an earthquake at its source: it is a single value, the same everywhere in the world for a given event. Intensity, on the other hand, describes the effects felt at a specific location: it varies with distance from the epicentre, the depth of the focus and the type of ground the waves pass through. A high-magnitude but very deep earthquake may be felt only mildly, while a more moderate but shallow and nearby one can cause significant local damage.

Depth, distance and local effects

This also explains why an earthquake whose epicentre lies offshore, tens or hundreds of kilometres from Lima, can be felt across several regions at once, with very different intensity depending on the ground it travels through. Distance alone does not determine felt intensity: local soil type plays an equally important role, as explained further in this guide.

The historical earthquakes that shaped Peru

Several major earthquakes have marked Peru's history. They are not mentioned here to impress, but because each one had a lasting influence on urban planning, building codes or the country's culture of prevention.

Date	Region	Magnitude	What to take from it
28 October 1746	Lima and Callao	≈ 8.5	The most destructive in Lima's history; the ensuing tsunami levelled the port of Callao. The founding event of the capital's seismic memory.
31 May 1970	Áncash	7.9	Most victims died in the ice and rock avalanche triggered on Huascarán, which buried the town of Yungay, rather than from direct building collapse. A reminder that an earthquake can trigger secondary hazards (landslides, avalanches) distinct from the shaking itself.
23 June 2001	Arequipa and southern Peru	8.4	Triggered a local tsunami that struck Camaná. Exposed gaps in disaster preparedness, particularly around warning and evacuation.
15 August 2007	Pisco, Ica region	7.9	Around 590 deaths and more than 91,000 homes destroyed, many built of unreinforced masonry (the collapse of the San Clemente church in Pisco became its lasting symbol). A turning point for Peruvian seismic engineering and the strengthening of the National Building Code.

The Pisco earthquake in particular illustrates a central lesson of this guide: the difference between buildings that survived and those that collapsed had less to do with age than with the quality of their design, materials and execution.

Why buildings don't all carry the same risk

This is the most important point in this guide. A territory exposed to earthquakes does not make every building equally vulnerable. A building's real resistance depends on a combination of factors, the main ones being:

• The code in force at the design stage. A building designed before the 2018, 2025 or 2026 strengthening of the E.030 standard does not necessarily meet the same requirements as a current project, without this automatically making it dangerous.
• The quality of the structural calculations and the experience of the engineering firm that designed the building.
• Site supervision and how faithfully construction followed the approved drawings.
• The materials used and compliance with concrete, steel or masonry standards and mix ratios.
• The foundations and how well they are suited to the actual ground, not a generic soil type.
• Structural regularity: a symmetrical, well-braced building performs better than an irregular one, or one with a very open, poorly rigid ground floor.
• Alterations made after construction: removed load-bearing walls, added floors that were never part of the original design, uncalculated extensions.
• Maintenance condition: corrosion of reinforcement bars, water infiltration, unmonitored cracks.
• The nature of the soil the building stands on, covered in the next section.

The year of construction remains a useful clue, but it is never sufficient proof of safety on its own. A poorly executed recent building should not automatically be considered more reliable than an older one that was properly designed and maintained.

The role of soil and subsoil

The motion felt at the surface during an earthquake is not produced by the shaking alone: it is also amplified or dampened by the nature of the ground the waves pass through. This is a technical point, but its broad outlines are accessible to anyone.

Rocky or compact soil generally transmits vibrations with less amplification. Fill material or loose soil, on the other hand, can amplify motion noticeably, sometimes significantly compared with a neighbouring rocky site. This is exactly what soil mechanics studies and seismic microzonation maps measure.

One specific phenomenon is worth mentioning: liquefaction. In certain water-saturated sandy soils, sufficiently strong shaking can cause the ground to temporarily lose its bearing capacity, which can seriously affect a building's foundations. This risk mainly concerns certain areas near old riverbeds, filled land or specific coastal sectors, not the territory as a whole.

Earthquake risk in Lima

Lima is where most of Swiss Lima Property's activity is concentrated, which justifies a dedicated section. Peru's capital combines characteristics that make any generalisation risky: a substantial population and housing stock, considerable variety between older, newer, formal and informal construction, and soil conditions that vary noticeably between coastal areas, river valleys, consolidated ground and filled sectors.

The districts typically sought out by Swiss and European buyers, namely Miraflores, Barranco, San Isidro, San Borja, Santiago de Surco, La Molina, Magdalena del Mar, San Miguel, Pueblo Libre, Jesús María, Lince and Surquillo, cannot be lumped together as "safe" or "risky". Soil conditions and construction quality can vary from one street to the next within the same district, and even more so from one plot to another. Our guide to Lima's districts details the general characteristics of each, without replacing an individual assessment of a specific property.

In other words, the quality of a property can never be inferred from its postcode alone. Two neighbouring buildings in the same sought-after district can have very different vulnerability levels depending on their design and upkeep.

The Costa Verde, cliffs and tsunami risk

Certain coastal areas of Lima combine several distinct types of risk that should not be confused: the seismic risk common to the whole city, the tsunami risk following a major offshore earthquake, and a localised ground-movement risk specific to the cliffs.

The Costa Verde cliffs

The Costa Verde, the coastal strip running along several Lima districts including Miraflores, Barranco and Chorrillos, is bordered by cliffs exposed to erosion and rockfall. The Autoridad del Proyecto Costa Verde, which reports to the Municipality of Lima, carries out permanent inspections and has identified more than a hundred critical points along the cliffs. A municipal ordinance declares a 120-metre-wide strip from the cliff edge intangible, meaning no construction is permitted there. This ground-movement risk is distinct from earthquake risk itself, even though an earthquake can occasionally worsen its effects.

Tsunami risk

The Peruvian coast, including Lima and Callao, is exposed to tsunami risk following a major offshore earthquake, as happened in 1746. The relevant authorities publish flood maps and evacuation routes for coastal areas.

Building codes in Peru

Peru's regulatory framework governs the design and construction of buildings through the Reglamento Nacional de Edificaciones (RNE), Peru's National Building Code, published by the Ministry of Housing, Construction and Sanitation (Ministerio de Vivienda, Construcción y Saneamiento). The RNE groups together several technical standards, the main structural ones being E.020 (loads), E.030 (seismic-resistant design), E.050 (soils and foundations), E.060 (reinforced concrete) and E.070 (masonry).

The E.030 standard, Diseño Sismorresistente

The E.030 standard sets the structural calculation requirements for earthquakes: seismic zones, building categories, soil classification, calculation coefficients. Approved in its modern form in 2016 and amended in 2018 following lessons learned, notably from the Pisco earthquake, it was revised again more recently: a modification under Resolución Ministerial 279-2025-VIVIENDA, in force since 3 November 2025, followed by a further modification under Resolución Ministerial 183-2026-VIVIENDA, published on 3 May 2026. This latest revision introduces new soil classification criteria, makes the predominant period of the ground a mandatory factor for certain building categories in the highest seismic zone, strengthens the requirement to analyse seismic forces simultaneously in both directions, and sets minimum requirements for seismic microzonation studies.

For a buyer, the practical value of this standard isn't in reading it line by line, but in knowing that a building was designed according to an identified version of the code, on a specific date, by an identifiable engineer of record. A project already approved or under construction before a new version takes effect can legally continue under the previous version, which is one more reason to always verify the exact design date rather than relying on a general impression.

Earthquake-resistant, not "earthquake-proof"

The terminology matters. An "earthquake-resistant" building is designed to reduce its vulnerability and protect the lives of its occupants during an earthquake, including a major one, without being guaranteed to escape all damage. The term "earthquake-proof", sometimes used in marketing materials, wrongly implies a total invulnerability that no construction can genuinely offer. A modern code aims to protect lives and reduce the risk of collapse, not to guarantee the total absence of damage after a major earthquake.

The role of municipalities and professionals

Each municipality issues building permits based on approved drawings, then verifies that the finished construction complies with those drawings. The engineers and architects responsible for a project must be registered with the Colegio de Ingenieros del Perú or the relevant professional body. It is this chain of accountability, approved drawings, an identified engineer, municipal oversight, that lets a buyer trace claims back to identifiable documents and people rather than mere marketing statements.

Older building or newer building?

No age threshold can automatically label a building as safe or dangerous. Each option has its own strengths and points to check.

	Possible strengths	Points to check
Newer building	A stricter applicable code, a normally more recent soil study, drawings more readily available, modern fittings and equipment.	The developer's track record, the real quality of execution, permit and compliance certificate, site supervision, whether a soil study was actually carried out, alterations made after handover.
Older building	Has already withstood several earthquakes without collapsing, sometimes robust construction, an established condominium, a maintenance history that is often observable.	The code in force when it was built, the visible state of the structure, cracks, corrosion, damp, alterations made, availability of drawings, a structural engineer's opinion when in doubt.

Checks to make before buying

Here is a concrete checklist of what to gather and observe before committing to a property.

Project documents

• Building permit (licencia de edificación) issued by the municipality, with approved drawings.
• Architectural and structural drawings matching the building as actually constructed.
• Soil mechanics study (estudio de mecánica de suelos, EMS) carried out for the plot.
• Construction compliance certificate (conformidad de obra), confirming construction matches the approved drawings.
• Declaration of construction (declaratoria de fábrica) registered with the Property Registry at SUNARP.
• Registry entry (partida registral) for the property and, for an apartment, its subdivision within the condominium regime.
• Condominium bylaws and documents relating to common areas.
• Any records of works or reinforcement carried out since construction.

The exact names of these documents and the procedures involved can vary slightly depending on the property's construction date: our guide to buying an apartment in Lima as a foreigner covers the acquisition process in full.

Questions to ask the developer or seller

• Who designed the structure, and which engineer is responsible for the calculations?
• Which company carried out the works, and which code was used for the design?
• Was a soil study carried out for this specific plot?
• Do the drawings exactly match the building as constructed? Were any walls removed or moved, any floors added?
• Has the building suffered damage in previous earthquakes? Were structural repairs carried out, and is there a technical report on file?
• How are the common areas maintained, and is the condominium's reserve fund adequate?

Visual observation: what a buyer can spot

Without claiming to replace a professional, an attentive buyer can spot certain signs that call for closer examination: significant or repeated cracks, particularly diagonal ones, visible deformation, apparent corrosion of reinforcement bars, deteriorated concrete, persistent damp, settling, strongly misaligned doors or windows, a very open ground floor with few load-bearing walls, damaged columns, visible but undocumented works, or apparent extensions on the roof.

When to bring in a structural engineer

An independent assessment is particularly worthwhile in several situations: an older building, the absence of available drawings, major works carried out after construction, worrying cracks, added floors, buying a standalone house rather than an apartment in an established condominium, an informal or partially regularised construction, doubts about the ground, a significant financial investment, or a major renovation project affecting the structure.

A structural engineer can examine the load-bearing structure, compare the drawings against the actual construction, assess cracks and their likely origin, inspect columns, beams, slabs and structural walls, evaluate the foundations where possible, analyse any alterations made, and indicate whether further studies are needed.

Fees for this kind of assessment vary considerably depending on the type of property, the scope of the review requested and the professional engaged: it is worth requesting several current quotes from engineers registered with the Colegio de Ingenieros del Perú rather than relying on a generic, potentially outdated price range.

Formal and informal construction

A formal construction is one that went through the full regulatory process: building permit, approved drawings, supervision, compliance certificate and a declaration of construction registered with the property registry. The term informal construction covers a range of situations, from an extension built without a permit to an entire building put up without technical supervision.

The absence of a permit or supervision increases uncertainty about structural quality, without necessarily meaning a construction is dangerous: some informal buildings are sound, and some formal ones were poorly executed. Later administrative regularisation proves the property's legal standing, not necessarily its technical quality: these are two distinct questions.

The best-documented risk involves the gradual addition of floors that were never part of the original structural calculation, or extensions built without any study or supervision: these alterations load a building beyond what it was designed to carry. It is a point worth checking systematically, whatever the property's legal status, by cross-checking the registry, the drawings and what is actually observed on site.

Buildings under construction and off-plan purchases

Buying off-plan requires particular scrutiny, since the building does not yet exist. Before committing, it is worth checking the developer's track record and previous projects, actual ownership of the land, whether a soil study exists, the identity of the engineer responsible for the calculations and the construction company selected, whether detailed structural drawings exist, the quality control arrangements during the build, the materials planned, the insurance covering the site, the delivery timeline, and the terms of final handover.

Our guide to buying off-plan in Lima covers this whole process for a foreign buyer.

Condominiums and building maintenance

A building's initial quality is not enough if its maintenance is neglected over time. Water infiltration, gradual corrosion of reinforcement, unmonitored cracks, private works affecting structural elements without authorisation, or the deterioration of common areas all progressively reduce a building's reliability, regardless of how well it was originally designed.

Before buying an apartment, it is worth asking the condominium's administration a few questions: how are the water tanks, emergency equipment, stairwells and emergency lighting maintained? Are signage and access routes kept clear? Are owners' meetings held regularly, and what recent decisions concerned repairs? Is the reserve fund adequate to finance proper maintenance over time?

Earthquake risk and property value

Several criteria linked to earthquake risk can influence how buyers perceive a property, without it being possible to derive a reliable discount or premium percentage from them: building quality, the developer's reputation, year of construction, maintenance condition, availability of documents, soil type, floor level, proximity to the coastline, the quality of the condominium, and any reinforcement work already carried out.

An entire district should not automatically command either a premium or a general discount on this basis alone: once again, it is the quality of the specific building that carries the most weight in how an informed buyer values a property.

Home insurance and earthquakes

Earthquake coverage is generally mandatory for any property financed through a mortgage granted by an institution supervised by the Superintendencia de Banca, Seguros y AFP (SBS): it is usually built into the monthly loan payment, at a rate typically close to 2% of the property's value per year, subject to checking current terms with the insurer. Borrowers have the right to take out their own policy instead of the one offered by default by the bank, provided it meets the minimum conditions set by the SBS and is accepted by the lending institution.

For a property bought outright, this insurance remains optional but recommended: nationwide coverage is still limited outside of mortgaged properties, which makes checking it all the more worthwhile for a buyer who wants to be protected. It is worth distinguishing coverage of the building itself, coverage of the home's contents, and the condominium's collective insurance, which generally covers common areas without replacing an individual policy. Coverage, deductibles and exclusions vary considerably between insurers and should be compared before choosing.

Preparing your home

Beyond the quality of the building itself, a few simple measures reduce the risk of injury and support an organised response to an earthquake, without requiring major work:

• Anchor tall furniture, shelving and the television.
• Keep heavy or fragile objects away from above beds.
• Identify the exits and safe areas of the home in advance.
• Keep emergency lighting and a fire extinguisher accessible.
• Know where the gas, water and electricity shut-offs are.
• Keep important documents and a list of useful contacts on hand.
• Draw up a simple family plan that accounts for children, older relatives and pets.

The emergency backpack

INDECI recommends preparing an emergency backpack able to cover the first 72 hours after a disaster, a period during which outside help can take time to arrive. A weight of around 8 kilograms per individual backpack is generally recommended.

Adapt the contents to your household's specific needs: infants, older relatives, pregnant women, anyone on regular medication, or pets. Check and refresh perishable items or expired medication regularly.

What to do during an earthquake

These recommendations follow INDECI's official guidance.

• Indoors: stay calm, move to a pre-identified safe area in the home, stay away from windows, never use the lift.
• In the street: move away from building facades, power poles, trees and overhead cables.
• In a car: pull over somewhere clear, away from bridges, buildings and power lines, and stay inside until the shaking stops.
• If evacuation is needed: follow INDECI's four basic rules: don't shout, don't run, don't push, don't go back.
• Near the coastline: if the shaking is strong or prolonged, move to higher ground without waiting for an official alert.

What to do after an earthquake

• Check yourself and those around you for injuries, before anything else.
• Shut off water, gas and electricity if recommended or if a leak is suspected.
• Use only a flashlight, never an open flame, if a gas leak is a possibility.
• Expect aftershocks and avoid visibly damaged structures.
• If you're near the sea, move away until tsunami risk has been officially ruled out.
• Follow official information rather than rumours, and avoid overloading phone networks.
• Have the building assessed by a professional if structural damage is suspected, before returning to normal occupancy.

This guide never replaces the relevant authorities or emergency services: whenever in doubt during or after an event, always follow the official instructions issued locally.

True or false: common misconceptions

Misconception	What to take from it
"A new building is always safe."	False. It benefits from a stricter code, but its safety also depends on the real quality of its design and execution.
"An old building still standing must be solid."	Not necessarily. Having withstood past shaking does not rule out gradual weakening from poor maintenance or later alterations.
"A higher floor is always more dangerous."	False as a general rule. Behaviour depends on the building's overall structural design, not height alone.
"The ground floor is always safer."	Also false. A very open ground floor with few load-bearing walls can actually weaken the whole structure.
"Sought-after districts carry no risk at all."	False. A district's price or reputation says nothing about the structural quality or soil of a specific building.
"A declared or regularised building must meet structural codes."	Not automatically. Administrative regularisation certifies the property's legal standing, not necessarily its technical quality.
"Small cracks never matter."	False. Even fine cracks can warrant a professional opinion depending on their location and how they evolve.
"Every crack is serious."	Also false. Many are superficial. Only a professional can reliably tell the two apart.
"A seafront apartment will definitely be hit by a tsunami."	False as a generalisation. It depends on the precise elevation, the shape of the coastline, and the official evacuation maps for the area.
"The label 'earthquake-proof' is enough to guarantee construction quality."	False. It's a marketing claim, not technical proof. Only drawings, the engineer of record and official documents are.
"You can know a building's risk from an online map alone."	False. A general map gives an area-wide trend, never an individual diagnosis of a specific building.

Final checklist before buying

A summary to run through before signing, organised into five categories.

Land and location

• Soil study available for the plot.
• Seismic microzonation map for the area checked.
• Additional risks identified (cliff edge, old riverbed, filled land).
• Evacuation routes checked if the property is near the coastline.

The building

• Year of construction and applicable code identified.
• Structural system and apparent condition observed.
• Known alterations and modifications.
• Maintenance of common areas checked.
• Known history from previous earthquakes.

Documents

• Building permit and approved drawings.
• Soil study and construction compliance certificate.
• Declaration of construction registered with SUNARP.
• Condominium bylaws and any technical reports available.

Professionals

• Developer identified and verifiable.
• Structural engineer and architect identified.
• Construction company identified.
• Independent inspection arranged if needed.

Preparedness

• Earthquake insurance reviewed.
• Family emergency plan in place.
• Safety equipment checked.
• Condominium organised and instructions clearly posted.

Decision-support table

This table does not produce an automatic "buy" or "don't buy" conclusion: it helps place each observation and decide whether it calls for further verification.

Observed criterion	Level
Structural drawings available and consistent	Reassuring
Soil study carried out and available for review	Reassuring
Recognised developer with verifiable prior projects	Reassuring
Recent building, designed to the current code	Reassuring, to confirm via documents
Regular, visible maintenance by the condominium	Reassuring
A few fine, superficial cracks with no known progression	Worth checking
Older building with no drawings immediately available	Worth checking
Slight misalignment of doors or windows, with no other signs	Worth checking
Significant or repeated diagonal cracks	Signal: professional opinion recommended
Added floors or undocumented structural changes	Signal: professional opinion recommended
Visible corrosion of reinforcement or deteriorated concrete	Signal: professional opinion recommended
No permit or identifiable documents at all	Signal: professional opinion recommended
Clear mismatch between drawings and the actual building	Signal: professional opinion recommended

The role of Swiss Lima Property

Frequently asked questions