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Differential Energy Radiation from Two Earthquakes in Japan with Identical MW

We examine two closely located earthquakes in Japan that had identical moment magnitudes M w but significantly different energy magnitudes M e . We use teleseismic data from the Global Seismograph Network and strong-motion data from the National Research Institute for Earth Science and Disaster Prevention’s K-Net to analyze the 19 October 1996 Kyushu earthquake ( M w 6.7, M e  6.6) and the 6 October 2000 Tottori earthquake ( M w 6.7, M e  7.4). To obtain regional estimates of radiated energy E S we apply a spectral technique to regional (<200 km) waveforms that are dominated by S and Lg waves. For the thrust-fault Kyushu earthquake, we estimate an average regional attenuation Q ( f )=230 f 0.65. For the strike-slip Tottori earthquake, the average regional attenuation is Q ( f )=180 f 0.6. These attenuation functions are similar to those derived from studies of both California and Japan earthquakes. The regional estimate of E S for the Kyushu earthquake, 3.8×1014 J, is significantly smaller than that for the Tottori earthquake, E S 1.3×1015 J. These estimates correspond well with the teleseismic estimates of 3.9×1014 J and 1.8×1015 J, respectively. The apparent stress ( τ a = μE S / M , with μ equal to rigidity) for the Kyushu earthquake is 4 times smaller than the apparent stress for the Tottori earthquake. In terms of the fault maturity model, the significantly greater release of energy by the strike-slip Tottori earthquake can be related to strong deformation in an immature intraplate setting. The relatively lower energy release of the thrust-fault Kyushu earthquake can be related to rupture on mature faults at a subduction environment. The consistence between teleseismic and regional estimates of E S is particularly significant as teleseismic data for computing E S are routinely available for all large earthquakes whereas often there are no near-field data.