My OperaDeep earthquakes
Friday, February 3, 2006 9:21:01 AM
The best estimate for the deepest known earthquake is 684 km deep, under the Fiji Islands in the Southwest Pacific, on 17 June 1977.
Yesterday, Thursday 2 February 2006, a strong earthquake, magnitude 6.6, occurred in the Fiji region at an estimated depth of 595.6 km.
http://earthquake.usgs.gov/eqcenter/recenteqsww/Quakes/usiram.php
Deep earthquakes even of this magnitude do not cause any (severe) damage.
Looking at the lower half of the map of historical seismicity http://neic.usgs.gov/neis/bulletin/neic_iram_h.html in this area it is easy to follow the inclination of the Benioff zone from shallow earthquakes, 0 – 36 km deep, to the deepest earthquakes 500 – 800 km deep. The earthquake foci normally plot along a dipping plane at an angle of 33 to 60 degrees and such a plane is called a Benioff zone. Earthquakes along Benioff zones define a lithospheric plate that descends into the mantle beneath another, overlying plate – in this case the Pacific Plate in the east sliding under the Australian Plate in the west. The zone is named after Hugo Benioff, a US seismologist who first described this feature.
Ole
Yesterday, Thursday 2 February 2006, a strong earthquake, magnitude 6.6, occurred in the Fiji region at an estimated depth of 595.6 km.
http://earthquake.usgs.gov/eqcenter/recenteqsww/Quakes/usiram.php
Deep earthquakes even of this magnitude do not cause any (severe) damage.
Looking at the lower half of the map of historical seismicity http://neic.usgs.gov/neis/bulletin/neic_iram_h.html in this area it is easy to follow the inclination of the Benioff zone from shallow earthquakes, 0 – 36 km deep, to the deepest earthquakes 500 – 800 km deep. The earthquake foci normally plot along a dipping plane at an angle of 33 to 60 degrees and such a plane is called a Benioff zone. Earthquakes along Benioff zones define a lithospheric plate that descends into the mantle beneath another, overlying plate – in this case the Pacific Plate in the east sliding under the Australian Plate in the west. The zone is named after Hugo Benioff, a US seismologist who first described this feature.Ole
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