At 20:55

PET A pet, or companion animal, is an animal kept primarily for a person's company or entertainment rather than as a working animal, livestock, or a laboratory animal. Popular pets are often considered to have attractive/ cute appearances, inte ...

(01:55

UTC Coordinated Universal Time (UTC) is the primary time standard globally used to regulate clocks and time. It establishes a reference for the current time, forming the basis for civil time and time zones. UTC facilitates international communica ...

on September 26) on 25 September 2005, an earthquake measuring 7.5 or 7.0 struck the

Department of Loreto Loreto () is Peru's northernmost department and region. Covering almost one-third of Peru's territory, Loreto is by far the nation's largest department, slightly smaller than Japan; it is also one of the most sparsely populated regions due to ...

in Peru, resulting in 20 fatalities and 266 injuries, with 1,316 homes damaged or destroyed, mostly in the town of

Lamas Lamas may refer to: * The plural form of Lama, a title for a teacher of the Dharma in Tibetan Buddhism. Places * Lamas Province, Peru ** Lamas District ** Lamas, Peru, the capital of Lamas Province and seat of Lamas District * Lamas (Braga), a pa ...

. It had a maximum perceived intensity of VI (''Strong'') on the

Modified Mercalli Intensity Scale The Modified Mercalli intensity scale (MM, MMI, or MCS) measures the effects of an earthquake at a given location. This is in contrast with the seismic magnitude usually reported for an earthquake. Magnitude scales measure the inherent force or ...

Tectonic setting

convergent boundary A convergent boundary (also known as a destructive boundary) is an area on Earth where two or more lithospheric plates collide. One plate eventually slides beneath the other, a process known as subduction. The subduction zone can be defined by a ...

lies off the coast of Peru, where the oceanic

Nazca plate The Nazca plate or Nasca plate, named after the Nazca region of southern Peru, is an oceanic list of tectonic plates, tectonic plate in the eastern Pacific Ocean basin off the west coast of South America. The ongoing subduction, along the Peru– ...

subducts or dives beneath the continental

South American plate The South American plate is a major tectonic plate which includes the continent of South America as well as a sizable region of the Atlantic Ocean seabed extending eastward to the African plate, with which it forms the southern part of the Mid ...

. The

Peru–Chile Trench The Peru–Chile Trench, also known as the Atacama Trench, is an oceanic trench in the eastern Pacific Ocean, about off the coast of Peru and Chile. It reaches a maximum depth of below sea level in Richards Deep () and is approximately long; ...

marks the location where the two plates meet and converge. The rate of

subduction Subduction is a geological process in which the oceanic lithosphere and some continental lithosphere is recycled into the Earth's mantle at the convergent boundaries between tectonic plates. Where one tectonic plate converges with a second p ...

at this boundary varies throughout its length; from per in the north, to per year in the south. The presence of active subduction produces large earthquakes when elastic energy along the plate boundary (megathrust) is released suddenly after decades or centuries of accumulated strain. Earthquakes rupturing the megathrust are known as

megathrust earthquake Megathrust earthquakes occur at convergent plate boundaries, where one tectonic plate is forced underneath another. The earthquakes are caused by slip along the thrust fault that forms the contact between the two plates. These interplate earthq ...

s; capable of generating

tsunamis A tsunami ( ; from , ) is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake. Earthquakes, volcanic eruptions and underwater explosions (including detonations, la ...

when there is sufficient and sudden uplift of the seafloor, leading to the sudden displacement of the seawater. Shallow inland crustal earthquakes within the overriding South American plate are caused by internal deformation of the crust within the

Andes Mountains The Andes ( ), Andes Mountains or Andean Mountain Range (; ) are the longest continental mountain range in the world, forming a continuous highland along the western edge of South America. The range is long and wide (widest between 18°S ...

; formed by the ongoing convergence. It has been suggested that a large

décollement Décollement () is a gliding plane between two rock masses, also known as a basal detachment fault. Décollements are a Deformation (geology), deformational structure, resulting in independent styles of deformation in the rocks above and below t ...

beneath the range is the source of these earthquakes. The

fold and thrust belt A fold and thrust belt is a series of mountainous foothills adjacent to an orogenic belt, which forms due to contractional tectonics. Fold and thrust belts commonly form in the forelands adjacent to major orogens as deformation propagates outwards ...

systems along the eastern foothills of the Andes are seismically active and produce thrust mechanism earthquakes. Normal and strike-slip mechanism earthquakes also occur within the shallow crust. Flat slab subduction beneath the Peruvian Andes also results in deformation of the South American plate, contributing to this occurrence. Earthquakes with similar magnitudes and mechanisms occurred close to the 2005 event in 1990, 1991,

2019 This was the year in which the first known human case of COVID-19 was documented, preceding COVID-19 pandemic, the pandemic which was declared by the World Health Organization the following year. Up to that point, 2019 had been described as ...

and

2021 Like the year 2020, 2021 was also heavily defined by the COVID-19 pandemic, due to the emergence of multiple Variants of SARS-CoV-2, COVID-19 variants. The major global rollout of COVID-19 vaccines, which began at the end of 2020, continued ...

Earthquake

The epicenter was located in the

, about northwest of

Yurimaguas Yurimaguas is a port town in the Loreto Region of the northeastern Peruvian Amazon. Historically associated with the Mainas missions, the culturally diverse town is affectionately known as the "Pearl of the Huallaga" (''Perla del Huallaga''). Y ...

Focal mechanism The focal mechanism of an earthquake describes the Fault (geology)#Slip.2C heave.2C throw, deformation in the Hypocenter, source region that generates the seismic waves. In the case of a Fault (geology), fault-related event, it refers to the ori ...

solutions indicate that rupture occurred on either a north or south-striking, moderately dipping

normal fault In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic ...

. Of these two possible fault orientations, finite fault modeling of globally recorded seismic data from the

United States Geological Survey The United States Geological Survey (USGS), founded as the Geological Survey, is an agency of the U.S. Department of the Interior whose work spans the disciplines of biology, geography, geology, and hydrology. The agency was founded on Mar ...

is more consistent with slip on the north-striking fault; the fault modeling also suggests up to of slip near the epicenter. With its hypocenter located roughly below the surface within the subducted

lithosphere A lithosphere () is the rigid, outermost rocky shell of a terrestrial planet or natural satellite. On Earth, it is composed of the crust and the lithospheric mantle, the topmost portion of the upper mantle that behaves elastically on time ...

of the

, the quake extended itself below the

Andes The Andes ( ), Andes Mountains or Andean Mountain Range (; ) are the List of longest mountain chains on Earth, longest continental mountain range in the world, forming a continuous highland along the western edge of South America. The range ...

and was felt in a large area, including the Peruvian coastal regions and as far away as

Bogotá Bogotá (, also , , ), officially Bogotá, Distrito Capital, abbreviated Bogotá, D.C., and formerly known as Santa Fe de Bogotá (; ) during the Spanish Imperial period and between 1991 and 2000, is the capital city, capital and largest city ...

Colombia Colombia, officially the Republic of Colombia, is a country primarily located in South America with Insular region of Colombia, insular regions in North America. The Colombian mainland is bordered by the Caribbean Sea to the north, Venezuel ...

, as well as most of

Ecuador Ecuador, officially the Republic of Ecuador, is a country in northwestern South America, bordered by Colombia on the north, Peru on the east and south, and the Pacific Ocean on the west. It also includes the Galápagos Province which contain ...

and western

Brazil Brazil, officially the Federative Republic of Brazil, is the largest country in South America. It is the world's List of countries and dependencies by area, fifth-largest country by area and the List of countries and dependencies by population ...

. It was also the strongest earthquake to hit Peru since

2001 The year's most prominent event was the September 11 attacks against the United States by al-Qaeda, which Casualties of the September 11 attacks, killed 2,977 people and instigated the global war on terror. The United States led a Participan ...

Impact

At least 20 people died, 266 others were injured and 39,000 residents were displaced, with the earthquake destroying or severely damaging 830 homes and leaving 486 others with minor damage, with most of the affected structures having been built with

adobe Adobe (from arabic: الطوب Attub ; ) is a building material made from earth and organic materials. is Spanish for mudbrick. In some English-speaking regions of Spanish heritage, such as the Southwestern United States, the term is use ...

. In

, 3,000 people were left homeless after the earthquake destroyed 102 houses and severely damaged 498 more, with the town recording five deaths and 60 injuries. Additionally, one woman was killed by a collapsing house in La Libertad, and one more death occurred in San Martín Province. In

Moyobamba Moyobamba () or Muyupampa ( Quechua ''muyu'' circle, ''pampa'' large plain, "circle plain") is the capital city of the San Martín Region in northern Peru. Called "Santiago of eight valleys of Moyobamba" or "Maynas capital". There are 50,073 inh ...

, the walls of some buildings collapsed. Damage and

power outage A power outage, also called a blackout, a power failure, a power blackout, a power loss, a power cut, or a power out is the complete loss of the electrical power network supply to an end user. There are many causes of power failures in an el ...

s also occurred in

Iquitos Iquitos (; ) is the capital city of Peru's Maynas Province, Peru, Maynas Province and Loreto Region. It is the largest metropolis in the Peruvian Amazon, east of the Andes, as well as the List of cities in Peru, ninth-most populous city in Peru ...

Cajamarca Cajamarca (), also known by the Quechua name, ''Kashamarka'', is the capital and largest city of the Cajamarca Region as well as an important cultural and commercial center in the northern Andes. It is located in the northern highlands of Per ...

Chiclayo Chiclayo (; mochica language, Mochica: ''Cɥiclaiæp'') is the principal city and capital of the Lambayeque region and Chiclayo Province in northern Peru. It is located from the Pacific coast, from the city of Trujillo, Peru, Trujillo, and from ...

Chimbote Chimbote ; ) is a city in northwestern Peru. It is the largest city in the Ancash Region and the List of cities in Peru, tenth most populous in Peru. With a population of 425,367 in 2017, it is the capital of both Santa Province and Chimbote Dist ...

Huacho Huacho () is a city in Peru, capital of the Huaura Province and capital of the Lima Region. Also is the most populated city of the Lima Region and Norte Chico civilization, Norte Chico. It is located 223 feet (68 metres) above sea level and 148&nbs ...

, Tumbes,

Sullana SullanaRegional Tourism Office of Piuraciudad de Sullana. Consulted on July 8, 2009. is a city in Peru and the capital of the Sullana Province, Piura, in the north-western coastal plains of Peru on the Chira valley. The city is home to 162,500 p ...

Piura Piura is a city in northwestern Peru, located north of the Sechura Desert along the Piura River. It is the capital of the Piura Region and the Piura Province. Its population was 484,475 as of 2017 and it is the 7th most populous city in Peru. ...

and

Pucallpa Pucallpa (, ; Shipibo language, Shipibo: ''May Ushin'') is a city in eastern Peru located on the banks of the Ucayali River, a major tributary of the Amazon River. It is the capital of the Ucayali region, the Coronel Portillo Province and the C ...

Response

Shortly after the earthquake, ten

Red Cross The organized International Red Cross and Red Crescent Movement is a Humanitarianism, humanitarian movement with approximately 16million volunteering, volunteers, members, and staff worldwide. It was founded to protect human life and health, to ...

volunteers from

visited Lamas to assist affected people. Even with diffcult weather conditions in the area, the Red Cross provided the National Institute of Civil Defence with 1,000 blankets, 50 tents and 200 packs containing clothes.

References

External links

Strong earthquake strikes northern Peru (Pictures of damage)
* {{DEFAULTSORT:2005 Northern Peru Earthquake Peru 2005

Earthquake An earthquakealso called a quake, tremor, or tembloris the shaking of the Earth's surface resulting from a sudden release of energy in the lithosphere that creates seismic waves. Earthquakes can range in intensity, from those so weak they ...