Макросейсмические сведения
о землетрясении 23 июня 2001 г. (20:33 UTC)
По данным NEIC, USGS
The earthquake occurred along the west coast of Peru, at the
boundary between the Nasca & South American plates. The earthquake
resulted from thrust faulting along this boundary as the Nasca plate
subducts beneath the South American plate. Several moderate aftershocks
have also been recorded, the largest being a magnitude 6.8. Other related
effects from Saturday's earthquake include several landslides as well as
a small coastal tsunami. In addition, considerable structural damage has
been reported in Arequipa as well as other towns in southern Peru. Please
consult media reports for more detailed information on damage and
casualties resulting from this earthquake.
Update 27 June 2001:
At least 102 people killed, 1,368 injured and extensive damage in
the Arequipa-Camana-Moquega-Tacna areas. At least 20 people killed
and some missing from a tsunami in the Camana-Chala area. Landslides
blocked highways in the epicentral area. Many of the historical
buildings in Arequipa were damaged or destroyed. Some people injured
and damage reported in the Arica, Chile area. Felt strongly in much
of southern Peru and northern Chile. Also felt in Bolivia.
Tsunami
generated with recorded wave heights (peak-to-trough) from selected
tide stations: 2.5m at Arica; 1.5m at Iquique; 1.0m at Coquimbo,Chile.
The earthquake occurred at the boundary between the Nazca and South
American tectonic plates. The two plates are converging towards each
other at a rate of 78mm per year (about three inches per year).
Seismographically recorded data indicate that the earthquake occurred
as thrust-faulting on the interface between the two plates, with the
South American plate moving up and seaward over the Nazca plate.
Southwestern Peru has a history of very large earthquakes. The June
23 shock originated just southeast of the source of a magnitude 7.7
earthquake that occurred in November 1996, and it appears to have
involved rupture of part of the plate-boundary segment that produced
an earthquake of magnitude approximately 9.0 in 1868. The 1868
earthquake was destructive in towns that were heavily damaged in
the June 23 earthquake. The 1868 earthquake produced a tsunami that
killed hundreds of people along the South American coast. The 1868
tsunami also caused damage in Hawaii and alarm in Japan.
URL:
http://zeus.wdcb.ru/wdcb/sep/strong/20010623/macro.html
Last revision July 09, 2001