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March 2010 Pichilemu earthquakes
March 11 2010 aftershocks.gif
Date 11:39:48, 11 March 2010 (UTC-3) (2010-03-11T11:39:48UTC-3)
Magnitude 6.9 Mw
Depth 31.2 kilometres (19 mi)[1]
Epicenter location Pichilemu, Chile
34°55′12″S 71°57′00″W / 34.920°S 71.950°W / -34.920; -71.950Coordinates: 34°55′12″S 71°57′00″W / 34.920°S 71.950°W / -34.920; -71.950
Countries or regions affected Chile
Max. intensity MM X

A 6.9 magnitude earthquake occurred on March 11, 2010, 40 kilometers southwest from Pichilemu, O'Higgins Region, Chile.[2][3][4][5][6] A general tsunami warning was not issued by the Pacific Tsunami Warning Center Pacific-wide, although they warned about the possibility of local tsunamis within 100 kilometers of the epicenter (between San Antonio and Concepción).[7]

USGS shake map of the earthquake

Contents

Background and tectonics

Although news media reported the earthquake as an aftershock of the February earthquake in Chile,[8][9] a preliminary geological summary given by the United States Geological Survey [10] considers it an independent earthquake. Though caused by by the regional stress caused by the February 27 earthquake, the March event was not an immediate adjustment to February's thrust fault rupture between the Nazca and South American plates, but was caused by normal faulting inside one of those plates. However, it has yet not been reliably determined in which plate the earthquake occurred.

Damage and casualties

Damage reported by the Chilean news media includes a collapsed pedestrian crossing over Chile Highway 5, north of Rancagua.[11] The place most affected by the earthquake was Pichilemu, the epicentre of the earthquake. It destroyed Ross Park, most of the Ross Casino and many houses in Espinillo and Rodeillo.[12] No casualties were reported.

The earthquake took place shortly before the new president, Sebastián Piñera, was sworn in, at about 12:15 PM local time (15:15 UTC), at the Chilean congress in Valparaíso, where the shaking was clearly felt. The presidents of Bolivia, Paraguay, and Ecuador were present when the earthquake occurred, however, the television footage showed that the inauguration was not interrupted.[13]

Aftershocks

Within the following six hours there were ten aftershocks, two of magnitude 6 or greater, and seven between 5 and 6. There were many aftershocks of lesser magnitude (up to 5) in the next four days.[14]

See also

References

  1. ^ UNIVERSIDAD DE CHILE, SERVICIO SISMOLOGICO
  2. ^ Magnitude 6.9 - LIBERTADOR O'HIGGINS, CHILE, U.S. Geological Survey, March 11, 2010, http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/us2010tsa6.php 
  3. ^ Doce réplicas con epicentro en Pichilemu, El Carabobeño, March 11, 2010, http://www.el-carabobeno.com/p_pag_not.aspx?art=a120310i02&id=t120310-i02 
  4. ^ El Mayor Fue de 7,2° Richter, Chile.com, March 11, 2010, http://www.chile.com/tpl/articulo/detalle/ver.tpl?cod_articulo=118476 
  5. ^ New Chile quake as Pinera sworn in as president, BBC News, 11 March 2010, http://news.bbc.co.uk/2/hi/americas/8561340.stm 
  6. ^ "24 Horas - Réplica: Onemi sitúa epicentro en Pichilemu". 24horas.cl. http://24horas.cl/videos.aspx?id=63158. Retrieved 2010-03-15. 
  7. ^ Tsunami information bulletin, Pacific Tsunami Warning Center, March 11, 2010, http://www.prh.noaa.gov/ptwc/messages/pacific/2010/pacific.2010.03.11.145212.txt 
  8. ^ "Americas - Chile president vows to rebuild". Al Jazeera English. 2010-03-05. http://english.aljazeera.net/news/americas/2010/03/2010311152233248405.html. Retrieved 2010-03-15. 
  9. ^ "New Chile quake as Pinera sworn in as president". BBC News. 2010-03-11. http://news.bbc.co.uk/2/hi/americas/8561340.stm. Retrieved 2010-03-15. 
  10. ^ Geological summary by the USGS
  11. ^ El Mercurio online, March 11
  12. ^ Pichilemu devastado, Canal 13 (Chile), March 16, 2010.
  13. ^ "Three strong earthquakes strike Chile in quick succession - CNN.com". Edition.cnn.com. http://edition.cnn.com/2010/WORLD/americas/03/11/chile.earthquake/index.html. Retrieved 2010-03-15. 
  14. ^ USGS list of earthquakes. Retrieved March 12 2010.
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Simple English

For a list of earthquakes in 2010 in Chile, see 2010 Chile earthquakes.
March 2010 Pichilemu earthquakes
File:March 2010 Chile earthquake intensity
Date 11:39:48, 11 March 2010 (UTC-3) (2010-03-11T11:39:48UTC-3)
Magnitude 6.9 Mw
Depth 31.2 kilometres (19 mi)[1]
Epicenter location Pichilemu, Chile
Countries or regions affected Chile
Max. intensity MM X

A 6.9 earthquake occurred on March 11, 2010, 40 kilometers southwest of Pichilemu, O'Higgins Region, Chile .[2][3][4][5][6] A tsunami warning was made by the Pacific Tsunami Warning Center Pacific-wide, although they warned of the possibility of local tsunamis within 100 kilometers of the epicenter (between San Antonio and Concepción).[7]

Although news media first reported the earthquake as an aftershock of the February earthquake[8][9], the initial geological summary given by the United States Geological Survey [10] said it was an independent earthquake. Though unchained by the regional stress caused by the February 27 earthquake, the March event was not an immediate adjustment to February's thrust fault rupture between the Nazca and South American plates, but it was caused by normal faulting inside one of those plates. However, it has not been confidently decided in which plate the earthquake occurred.

Within 6 hours, 10 aftershocks took place, of these 2 were of magnitude 6 or greater and 7 between magnitude 5 and 6.[11]

The earthquake took place shortly before the new president, Sebastián Piñera, was sworn in, at about 12:15 PM local time (15:15 UTC), at the Chilean congress in Valparaíso, where the shaking was clearly felt. The presidents of Bolivia, Paraguay, and Ecuador were present when the earthquake occurred, however, the television footage showed that the inauguration was not interrupted.[12]

Damages reported by the Chilean news media include a collapsed pedestrian crossing over Chile Highway 5, north of Rancagua.[13] The most affected place by the earthquake was Pichilemu, the epicentre of the earthquake. It destroyed the Ross Park, the most of the Agustín Ross Cultural Centre and many houses in Espinillo and Rodeillo.[14]

May 2, 2010 aftershock

May 2010 Pichilemu earthquake
File:5.
Date 10:52:39, 02 May 2010 (UTC-4) (2010-05-02T10:52:39UTC-4)
Magnitude 5.9 Mw
Depth 35.9 kilometres (22 mi)[15]
Epicenter location Pichilemu, Chile
Countries or regions affected Chile
Max. intensity MM VI

The May, 2 2010 Pichilemu earthquake was a magnitude 6.0 MW earthquake that struck off Pichilemu, Chile, at 10:52 AM on May 2, 2010 at the epicenter, at a depth of 31 kilometres (19 mi). USGS described that the epicenter was 70 kilometres (43 mi) south-southwest of San Antonio, 105 kilometres (65 mi) west Regional capital of Rancagua, 105 kilometres (65 mi) northwest of Curicó and 140 kilometres (87 mi) southwest of the Chilean capital of Santiago.[16]

After almost exactly three hours later a second quake occurs in the same area with an intensity of 4.8 MW[17]

More than 10 aftershocks were produced in May 2 and 3.

Other pages

References

  1. UNIVERSIDAD DE CHILE, SERVICIO SISMOLOGICO
  2. Magnitude 6.9 - LIBERTADOR O'HIGGINS, CHILE, U.S. Geological Survey, March 11, 2010, http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/us2010tsa6.php .
  3. Doce réplicas con epicentro en Pichilemu, El Carabobeño, March 11, 2010, http://www.el-carabobeno.com/p_pag_not.aspx?art=a120310i02&id=t120310-i02 
  4. El Mayor Fue de 7,2° Richter, Chile.com, March 11, 2010, http://www.chile.com/tpl/articulo/detalle/ver.tpl?cod_articulo=118476 
  5. New Chile quake as Pinera sworn in as president, BBC News, 11 March 2010, http://news.bbc.co.uk/2/hi/americas/8561340.stm 
  6. http://24horas.cl/videos.aspx?id=63158
  7. TSUNAMI INFORMATION BULLETIN, Pacific Tsunami Warning Center, March 11, 2010, http://www.prh.noaa.gov/ptwc/messages/pacific/2010/pacific.2010.03.11.145212.txt .
  8. [1]
  9. [2]
  10. Geological summary by the USGS
  11. USGS list of earthquakes, retrieved March 12
  12. http://edition.cnn.com/2010/WORLD/americas/03/11/chile.earthquake/index.html
  13. El Mercurio online, March 11
  14. Pichilemu devastado, Canal 13 (Chile), March 16, 2010.
  15. UNIVERSIDAD DE CHILE, SERVICIO SISMOLOGICO
  16. "Magnitude 6.0 - LIBERTADOR O'HIGGINS, CHILE". USGS. 2010-5-2. http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/us2010vubl.php#details. Retrieved 2010-5-2. 
  17. "Magnitude 4.8 - OFFSHORE LIBERTADOR O'HIGGINS, CHILE". USGS. 2010-5-2. http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/us2010vubw.php. Retrieved 2010-5-2. 


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