This Special Event web page is intended to provide direct links to and images of
data and materials available from IRIS programs and preliminary research results
from the seismology community. We welcome any additional contributions that might
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A magnitude 9.0 earthquake has occurred near the east coast of Honshu, Japan, as a result of thrust faulting on or near the subduction zone interface plate boundary between the Pacific and North American plates. This page collects many disparate data visualizations from across the websphere.
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A magnitude 9.0 earthquake has occurred near the east coast of Honshu, Japan, as a result of thrust faulting on or near the subduction zone interface plate boundary between the Pacific and North American plates. This earthquake generated a tsunami, and a tsunami warning was issued throughout the Pacific.
Numerous websites have been developed that provide access to the extensive information resources related to this earthquake. The emphasis of this page is on seismological data, products and early results. In addition to direct links to data and materials available from IRIS programs, this page includes a compilation of preliminary research results from the seismological community.
IRIS Education and Public Outreach and the University of Portland have established routine procedures to develop a set of “Teachable Moments” which provide a short summary of the latest major earthquake within a few hours to one day after an event. Prepared by seismologists and educators, “Teachable Moments” include powerpoint slides, .pdf presentations and animations.
First five days of aftershocks from the March 11, 2011 M9.0 earthquake in Japan (mp4 video).
Note that there have been so many aftershocks that not all have yet been located. Earthquake data from the NEIC website.
Cumulative seismic moment estimated for shallow earthquakes. Modified from Ammon et al., SRL 2010 – moment magnitude values assumed for the largest earthquakes were (9.0, 1952), (9.5, 1960), (9.2, 1964), (9.15, 2004), (9.05, 2011) and extended to the present using magnitude estimates from the US Geological Survey and the Global Centroid Moment Tensor Project (Harvard & Columbia Universities).