[SSS12-P01] Regional difference in long period surface wave phase velocity by an explosive phenomenon generated in North Korea on September 3, 2017
Keywords:Explosive phenomenon generated in North Korea, Long period surface wave, Homo, Multichannel Analysis of Surface Wave
The observed Rayleigh wave shows strong dispersibility at around 0.03-0.1Hz. After performing MASW (Multichannel Analysis of Surface Wave) for the Kinki districts where P-wave velocity structure is estimated using data of the large blast observation, the provided phase velocity almost matching with the one dimension S-wave velocity structure that I set in reference to Hirose& Ito (2006). Yamada(2018) thought that the observed phase velocity dependend on velocity structure to the Moho.
Because after doing MASW at a suitable angle based on the direction from the seismic center about each domestic area, a local difference was seen in provided phase velocity, I report it.
In this study, I used the observation record of broadband Seismograph network (F-net), high sensitivity seismograph network (Hi-net) by NIED, each national university, and Japan Meteorological Agency.