Microseismicity After Pohang Earthquake in South Korea

Date: 4/25/2019

Time: 06:00 PM

Room: Grand Ballroom

Earthquake activities in and around the Korean Peninsula are relatively low in number and intensity compared with those in the neighboring countries, such as Japan and China. From 1978 to 2018, a total of 1,798 earthquakes with magnitude larger than 2.0 has occurred in and around the vicinity of the Korean Peninsula. Specifically, the annual average number of earthquake occurrence increased after the largest earthquake (ML 5.8) occurred in Gyeongju area in 2016 and Pohang earthquake (ML 5.4) in 2017. We relocated the events occurred during 2018, and determined using Hypoinverse program with various crustal models and analyzed the results. The magnitudes of relocated events range from 1.0 to 2.5 on the Richter scale. The accuracy of the relocation is less than 3km of hypocenter including about 2km of depth error ranges. The newly determined origin times with error less than 0.2seconds ranges about 82~93% according to applied different crustal models. In addition, we compared the spatial and temporal distributions of events before and after two largest earthquakes.

Presenting Author: Jimin Lee

Authors