Earthquakes
My Blogs (olelog) are mainly based on my daily reading of earth science news. Here on whatonearth.olehnielsen.dk I try to weave some of the pieces together to a greater whole with added background info.

Most eartquakes are related to plate tectonics and most of them occur near plate boundaries.

The worst eartquake so far occured in China (Shensi) on 23 January 1556 with ca. 830,000 casualties (including landslide victims).

The worst eartquake in the 20^th century.

Deep earthquakes. The best estimate for the deepest known earthquake is 684 km deep, under the Fiji Islands in the Southwest Pacific, on 17 June 1977. See also my blog Deep Earthquakes of Friday, 3 February 2006.

Silent earthquakes. A silent earthquake is happening so slowly, that you don't hear or feel it. In November 2000 a silent earthquake on the Big Island of Hawaii moved silently for 36 hours (replacing 2,000 km3 of rocks).

Glacial earthquakes

Subduction zone plate boundaries produce three types of earthquakes:

Real subduction earthquakes, which occur due to differential movement (co-seismic slip) at the interface between the oceanic plate and the continental plate. These earthquakes occur offshore, they are relatively shallow (typically less than 30 km deep), and can be of magnitude 8 or greater. Shallow (less than 30 km deep), crustal, intraplate earthquakes. These earthquakes, which are caused by faults in the continental plate, can exceed magnitude 7. Deep, intraplate earthquakes, caused by bending fracture of the subducting oceanic plate. These earthquakes can reach magnitudes 7-7.5.

Earthquakes treated in Olelog

Banda Sea January 2006

Lake Tanganyika (Kalemie) December 2005

Iran November 2005

Mid Indian Ridge November 2005

Japan November 2005

Japan November 2005

Japan

Kashmir

Afar

Kashmir October 2005

Earthquake prediction

Early warning in japan

Earthquake prediction (USA)

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