TY - JOUR
T1 - The largest earthquakes we should prepare for
AU - Matsuzawa, Toru
PY - 2014/6
Y1 - 2014/6
N2 - We should estimate the size of the largest earthquakes carefully to minimize future earthquake losses. Taking the earth's size and the thickness of the lithosphere into account, the largest earthquakes are estimated to have a magnitude (M) of 11. The occurrence of such a gigantic earthquake, however, could wipe out the human race because energy from an M11 earthquake would be as large as the asteroid impact that is thought to have caused the extinction of the dinosaurs. This would make it meaningless to prepare for M11 earthquakes. It would be more realistic to calculate the seismic moment expected from the longest plate boundary, i.e., from the northern to northwestern boundary of the Pacific plate. The plate boundary is about 10,100 km long and the magnitude of an earthquake occurring there is estimated at approximately 10, assuming that the fault is 200 km wide and average slip is 20 m. This means that M10 events would be the largest earthquakes we could estimate as occurring. It will not be pragmatic, however, to attempt to devise measures against such extremely rare events. It is nonetheless important to numerically simulate beforehand what might happen during such events to quickly and accurately determine the initial response to quake shaking and tsunamis.
AB - We should estimate the size of the largest earthquakes carefully to minimize future earthquake losses. Taking the earth's size and the thickness of the lithosphere into account, the largest earthquakes are estimated to have a magnitude (M) of 11. The occurrence of such a gigantic earthquake, however, could wipe out the human race because energy from an M11 earthquake would be as large as the asteroid impact that is thought to have caused the extinction of the dinosaurs. This would make it meaningless to prepare for M11 earthquakes. It would be more realistic to calculate the seismic moment expected from the longest plate boundary, i.e., from the northern to northwestern boundary of the Pacific plate. The plate boundary is about 10,100 km long and the magnitude of an earthquake occurring there is estimated at approximately 10, assuming that the fault is 200 km wide and average slip is 20 m. This means that M10 events would be the largest earthquakes we could estimate as occurring. It will not be pragmatic, however, to attempt to devise measures against such extremely rare events. It is nonetheless important to numerically simulate beforehand what might happen during such events to quickly and accurately determine the initial response to quake shaking and tsunamis.
KW - Initial response to the earthquake and tsunami
KW - Largest earthquakes
KW - M10
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U2 - 10.20965/jdr.2014.p0248
DO - 10.20965/jdr.2014.p0248
M3 - Article
AN - SCOPUS:84901721946
SN - 1881-2473
VL - 9
SP - 248
EP - 251
JO - Journal of Disaster Research
JF - Journal of Disaster Research
IS - 3
ER -