Abstract
The crustal structure in the northern Kinki district is examined using apparent velocities of P first arrivals from crustal earthquakes. Data used were mainly obtained by the seismic network of the Regional Center for Earthquake Prediction of Kyoto University. It is most characteristic in this study that no sharp discontinuity in the seismic wave velocity is found at the depth of the Conrad discontinuity. This is suggested by the fact that first arrivals from the 1984 Yamasaki Fault earthquake of about 20km depth show an apparent velocity of about 6.45km/s and their plots against epicentral distances do not suggest the head wave propagating along the Conrad discontinuity. Furthermore, it is examined that the Moho discontinuity is about 36km in depth and the Pn wave about 7.8km/s in velocity. A constant velocity near 6.0km/s is feasible for the P wave in the upper crust of a depth range from 4 to 13km in which the most part of crustal earthquakes occur.
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Zisin (Journal of the Seismological Society of Japan. 2nd ser.)
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
