2007 Tocopilla earthquake

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2007 Tocopilla earthquake
2007 14 Nov Chile earthquake.png
UTC time2007-11-14 15:40:50
ISC event13266131
USGS-ANSSComCat
Local dateNovember 14, 2007 (2007-11-14)
Local time12:40
Duration3:35
Magnitude7.7 Mw [1]
Depth40 km (25 mi) [1]
Epicenter22°19′30″S 69°58′08″W / 22.325°S 69.969°W / -22.325; -69.969Coordinates: 22°19′30″S 69°58′08″W / 22.325°S 69.969°W / -22.325; -69.969
TypeThrust [2]
Areas affectedChile
Max. intensityVIII (Severe)
Tsunami25.5 cm (10.0 in) [2]
Casualties2 killed [3]
65 injured [3]

The 2007 Tocopilla earthquake occurred on November 14 at 12:40:50 local time. Its epicenter was located between Quillagua and Tocopilla, affecting the Tarapacá and the Antofagasta regions in northern Chile. The earthquake had a moment magnitude of 7.7 and lasted about 3 minutes and 35 seconds.[4] Seventeen aftershocks of magnitude greater than 5.3, including one of magnitude 7.1 and two others of magnitude 6.3 or higher, were recorded.[5] The Pacific Tsunami Warning Center issued a tsunami warning, stating a tsunami had been generated; after one hour, this warning was cancelled.[6][7] The earthquake was felt from Santiago, 1,245 km south from the epicenter, to La Paz, about 700 km north-northeast.[8]

Tectonic summary[edit]

The USGS reported that the earthquake resulted from the release of stresses generated by the subduction of the oceanic Nazca plate beneath the South American Plate. In this region, known as the Peru-Chile subduction zone, the Nazca Plate thrusts beneath South America at a rate of approximately 79 mm/year in an east-north-east direction. This earthquake indicates subduction-related thrusting, likely on the interface between these two plates.

This earthquake occurred near (and within) the southern end of the rupture area of the great magnitude 9.1 earthquake of 1877, which produced a destructive tsunami and whose source region has since the late 1970s been recognized as a potentially dangerous seismic gap. In 1995, a magnitude 8.0 earthquake occurred in the same subduction zone approximately 200 km further south of the November 14th event.[9]

Damage and casualties[edit]

At least two deaths have been attributed to this earthquake: an 88-year-old woman crushed under a collapsing wall at Tocopilla,[8] and a 54-year-old woman whose exact cause of death remains unknown. There were also reports of widespread power outages in the region, including the cities of Antofagasta, Calama and Arica. The earthquake disrupted copper mining in the region; because Chile is the world's top supplier of copper, the earthquake caused prices of the metal to jump by more than six percent. Tin prices also rose four percent to reach a record high.[10] There were reports of several dozen road workers trapped inside a collapsed highway tunnel.[11] Two hundred homes were destroyed by the shaking and up to 15,000 people were displaced. In Tocopilla alone, 1,000 homes were demolished, representing 30 percent of all standing structures.[12]

See also[edit]

References[edit]

  1. ^ a b ISC (19 January 2015), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009), Version 2.0, International Seismological Centre
  2. ^ a b USGS. "M7.7 - Antofagasta, Chile". United States Geological Survey.
  3. ^ a b USGS (September 4, 2009), PAGER-CAT Earthquake Catalog, Version 2008_06.1, United States Geological Survey
  4. ^ Terra.cl, 14/11/07, "Fuerte sismo sacudió esta tarde al Norte del País". Archived from the original on 2008-01-20.
  5. ^ Magnitude 7.1, Antofagasta earthquake Archived 2007-11-16 at the Wayback Machine. of 15 November 2007
  6. ^ NOAA Pacific Tsunami Warning Center
  7. ^ Cancellation bulletin issued by the PTWC
  8. ^ a b Strong earthquake shakes northern Chile, kills at least two Archived 2007-11-16 at the Wayback Machine. AFP news report
  9. ^ Magnitude 7.7 - ANTOFAGASTA, CHILE
  10. ^ Metals prices up after Chile quake Archived 2007-11-18 at the Wayback Machine. The Australian Business
  11. ^ Workers trapped in tunnel collapse after quakes Archived 2012-02-07 at the Wayback Machine., Radio New Zealand News
  12. ^ Chile rattled by big aftershocks, BBC News

External links[edit]

 This article incorporates public domain material from websites or documents of the United States Geological Survey.