関東・東海地域におけるコーダQ-1の地域性
1986 年 39 巻 2 号 p. 241-249
詳細
1986 年 39 巻 2 号 p. 241-249
The decay rate of coda envelopes of small local earthquakes is characterized by QC-1. Analyzing records of 95 local earthquakes at 10 stations in the Kanto-Tokai district, we found regional differences in QC-1. Frequency dependence of QC-1 from 1 to 16Hz was measured from the logarithmic decay curves of RMS band-pass filtered seismograms. The fQC-1 value is low in the northern Kanto, high along the coast of the Pacific Ocean, and is 1.1×10-2s-1 on average, where f is frequency in Hz. The regional difference in a power low dependence of the form QC-1∝fn was studied. The n value is close to -0.6 in the southeastern Kanto, and close to -0.9 in the Tokai and the western Kanto, and -0.86 on average.
