Earth Planets Space, Vol. 57 (No. 4), pp. 339-343, 2005LETTER
Katsuhisa Kanda and Masayuki Takemura
Kobori Research Complex, Kajima Corporation, Akasaka, Minato-ku, Tokyo 107-8502, Japan
(Received November 30, 2004; Revised April 16, 2005; Accepted April 16, 2005)
An inversion analysis has been developed to evaluate short-period radiation zones on an earthquake fault plane using seismic intensity data. It is robust and widely applicable even for historical earthquakes without ground motion, tsunami and geodetic data observed by instruments. It was applied to the 2004 off the Kii peninsula earthquakes that occurred in the Philippine Sea plate along the Nankai Trough. The short-period seismic wave radiation zone of each event during the 2004 off the Kii peninsula earthquakes from the inversion analysis was included in epicenter area of the corresponding aftershocks and slipped fault zone derived from the waveform inversion analysis as well. It may be also found that there were slip areas where little short period energy radiated. It also applied to the 1899/3/7 earthquake whose felt area was similar to that of the 2004 off the Kii peninsula earthquakes. However, it was indicated that the short-period radiation zones of the 1899 earthquake was located near the coast of the Kii peninsula and departed from that of the 2004 earthquake. The 1899 event might be an intermediate-depth earthquake in the Philippine Sea plate or a relative small interplate event at the west margin of the Tonankai earthquake source region.
Key words: Seismic intensity, inversion analysis, historical earthquake, Nankai trough, radiation energy.