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2005 Northern Peru earthquake
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2005 Northern Peru earthquake
2005-09-26 01:55:37
usp000e09h
7951634
Peru Peru physical map.svg
1
Peru -6.417 -76.53 bottom Lamas 90 Black pog.svg
Peru -6.042 -76.970 left Moyobamba 90 Black pog.svg
Peru -12.04 -77.03 Lima 90 Black pog.svg
Peru -5.678 -76.398 50 Bullseye1.png
260
center
2005 9 25
20:55:37 PET (UTC-5)
50 secondsRed Cross ReliefWeb 29 September 2005 28 November 2024 Brigadistas de la Cruz Roja Peruana intervienen en las poblaciones afectadas por sismo en selva peruana https://reliefweb.int/report/peru/brigadistas-de-la-cruz-roja-peruana-intervienen-en-las-poblaciones-afectadas-por-sismo es
7.5 w y7.0 l y
115.0 km mi 0 on
-5.678 -76.398 region:PE_type:event inline,title
Normal
northern Peru
6
20 dead, 266 injuredUn día como hoy el norte del Perú fue afectado por un terremoto de 7.5 grados 25 September 2017 On a day like today, northern Peru was affected by a 7.5-degree earthquake https://fpp.org.pe/un-dia-como-hoy-el-norte-del-peru-fue-afectado-por-un-terremoto-de-7-5-grados/?amp=1 es 11 December 2022
At 20:55 PET (01:55 UTC on September 26) on 25 September 2005, an earthquake measuring w 7.5 or l 7.0 struck the Department of Loreto in Peru, resulting in 20 fatalities and 266 injuries, with 1,316 homes damaged or destroyed, mostly in the town of Lamas. It had a maximum perceived intensity of VI (Strong) on the Modified Mercalli Intensity Scale.M 7.5 – 39 km NW of Yurimaguas, Peru https://earthquake.usgs.gov/earthquakes/eventpage/usp000e09h/executive United States Geological Survey 19 February 2022
Tectonic setting
A 7,000 km convergent boundary lies off the coast of Peru, where the oceanic Nazca plate subducts or dives beneath the continental South American plate. The Peru–Chile Trench marks the location where the two plates meet and converge. The rate of subduction at this boundary varies throughout its length; from 65 mm per in the north, to 80 mm per year in the south.Gavin P. Hayes Gregory M. Smoczyk Harley M. Benz Kevin P. Furlong Antonio Villaseñor Seismicity of the Earth 1900–2013, Seismotectonics of South America (Nazca Plate Region) Open-File Report https://pubs.usgs.gov/of/2015/1031/e/ United States Geological Survey Open-File Report 2015–1031–E 10.3133/ofr20151031E 2015 2015usgs.rept...25H free subscription 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 earthquakes; capable of generating tsunamis 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; formed by the ongoing convergence. It has been suggested that a large décollement beneath the range is the source of these earthquakes. The fold and thrust belt 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.S. Devlin B. L. Isacks M. E. Pritchard W. D. Barnhart R. B. Lohman Depths and focal mechanisms of crustal earthquakes in the central Andes determined from teleseismic waveform analysis and InSAR Tectonics 2012 31 2 2011TC002914 10.1029/2011TC002914 American Geophysical Union 2012Tecto..31.2002D 128926791 free Earthquakes with similar magnitudes and mechanisms occurred close to the 2005 event in 1990, 1991, 2019 and 2021.
Earthquake
The epicenter was located in the Department of Loreto, about 39 km mi on northwest of Yurimaguas. Focal mechanism solutions indicate that rupture occurred on either a north or south-striking, moderately dipping normal fault. Of these two possible fault orientations, finite fault modeling of globally recorded seismic data from the United States Geological Survey is more consistent with slip on the north-striking fault; the fault modeling also suggests up to 6.4404 m ft of slip near the epicenter. With its hypocenter located roughly 115 km mi on below the surface within the subducted lithosphere of the Nazca plate, the quake extended itself below the Andes and was felt in a large area, including the Peruvian coastal regions and as far away as Bogotá, Colombia, as well as most of Ecuador and western Brazil. It was the strongest earthquake to hit Peru since 2001.
Impact
At least 20 people died, 266 others were injured and 39,000 residents were displaced, with the earthquake destroying or severely damaging 830 homesInternational Federation of Red Cross and Red Crescent Societies ReliefWeb 30 September 2005 28 November 2024 Peru: Earthquake Minor Emergency Bulletin No. 1 https://reliefweb.int/report/peru/peru-earthquake-minor-emergency-bulletin-no-1 and leaving 486 others with minor damage, with most of the affected structures having been built with adobe.ACT Alliance ReliefWeb 28 September 2005 28 November 2024 ACT Alert Perú 1/05: Perú Earthquake https://reliefweb.int/report/peru/act-alert-per%C3%BA-105-per%C3%BA-earthquake In Lamas, 3,000 people were left homeless after the earthquake destroyed 102 houses and severely damaged 498 more,ReliefWeb Reuters 27 September 2005 28 November 2024 Five killed in Peru quake, thousands homeless https://reliefweb.int/report/peru/five-killed-peru-quake-thousands-homeless with the town recording five deaths and 60 injuries.USGS ReliefWeb 26 September 2005 28 November 2024 M=7.5 Northern Peru Preliminary Earthquake Report https://reliefweb.int/report/peru/m75-northern-peru-preliminary-earthquake-report Additionally, one woman was killed by a collapsing house in La Libertad, and one more death occurred in San Martín Province. In Moyobamba, the walls of some buildings collapsed. Damage and power outages also occurred in Iquitos, Cajamarca, Chiclayo, Chimbote, Huacho, Tumbes, Sullana, Piura and Pucallpa.
Response
Shortly after the earthquake, ten Red Cross volunteers from Moyobamba visited Lamas to assist affected people. Even with difficult 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.
See also
List of earthquakes in 2005
List of earthquakes in Peru
References
External links
Strong earthquake strikes northern Peru (Pictures of damage)
7951634
Peru 2005
Earthquake
2005 Northern
Category:2005 disasters in Peru