Tertiary Waves Measured during 2017 Pohang Earthquake Using an Underwater Glider SCIE SCOPUS

Cited 1 time in WEB OF SCIENCE Cited 1 time in Scopus
Title
Tertiary Waves Measured during 2017 Pohang Earthquake Using an Underwater Glider
Author(s)
Lee, Jung-Han; Ko, Sung-Hyub; Jung, Seom-Kyu; Hyeon, Jong-Wu
KIOST Author(s)
Lee, Jung Han(이정한)Ko, Sung Hyub(고성협)Hyeon, Jong Wu(현종우)
Alternative Author(s)
이정한; 고성협; 정섬규; 현종우
Publication Year
2019-09
Abstract
An underwater glider equipped with a hydrophone observed the acoustic sounds of an earthquake that occurred on 15 November 2017 05:29:32 (UTC) in the Pohang area. The underwater glider observed the earthquake sounds after 19 s (05:29:51) at approximately 140 km from the Pohang epicenter. In order to distinguish the earthquake sound from the glider's operation noise, the noise sources and Sound Pressure Level (SPL) of the underwater glider were analyzed and measured at laboratory tank and sea. The earthquake acoustic signal was distinguished from glider's self-noises of fin, pumped Conductivity-Temperature-Depth profiler (CTD) and altimeter which exist over 100 Hz. The dominant frequencies of the earthquake acoustic signals due to the earthquake were 10 Hz. Frequencies at which the spectra had dropped 60 dB were 50 Hz. By analysis of time correlation with seismic waves detected by five seismic land stations and the earthquake acoustic signal, it is clearly shown that the seismic waves converted to Tertiary waves and then detected by the underwater glider. The results allow constraining the acoustic sound level of the earthquake and suggest that the glider provides an effective platform for enhancing the earth seismic observation systems and monitoring natural and anthropogenic ocean sounds.
ISSN
2076-3417
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/531
DOI
10.3390/app9183860
Bibliographic Citation
APPLIED SCIENCES-BASEL, v.9, no.18, 2019
Publisher
MDPI
Keywords
underwater glider; Pohang earthquake; tertiary waves (T-Waves); acoustic signal
Type
Article
Language
English
Document Type
Article
Publisher
MDPI
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