Epicenter Relocation of Mw 6.3 Aftershocks in Mae Lao District, Chiang Rai Province, Northern Thailand using a Circle Method

Netima Chiwpraditkun; Ratchadaporn Chookua; Wilaiwan Srisawat; Kasemsak Saetang

Netima Chiwpraditkun Nakhon Si Thammarat Rajabhat University
Ratchadaporn Chookua Nakhon Si Thammarat Rajabhat University
Wilaiwan Srisawat Nakhon Si Thammarat Rajabhat University
Kasemsak Saetang Nakhon Si Thammarat Rajabhat University

Keywords: aftershock, P wave, S wave, body wave, Phayao fault zone

Abstract

An M_w 6.3 earthquake that occurred on 05 May 2014 in Mae Lao District, Chiang Rai Province, Northern Thailand, and its aftershocks were reported by Earthquake Observation Division, Thai Meteorological Department (TMD). This research presented the distribution of 336 aftershock epicenters recorded by five seismic stations. 3,360 data of P- and S-waves arrival times were manually picked with 1-10 Hz bandpass filtering. The results showed that the epicenters of aftershocks were found along fault lines.