https://scholars.lib.ntu.edu.tw/handle/123456789/606248
標題: | Controls on Seasonal Variations of Crustal Seismic Velocity in Taiwan Using Single-Station Cross-Component Analysis of Ambient Noise Interferometry | 作者: | Feng K.-F Huang H.-H Hsu Y.-J YIH-MIN WU |
關鍵字: | ambient noise interferometry;seasonal velocity changes;single-station cross-component method;stretching technique;Taiwan orogenic belt;ambient noise;crustal structure;interferometry;orogenic belt;seasonal variation;seismic velocity;Taiwan | 公開日期: | 2021 | 卷: | 126 | 期: | 11 | 來源出版物: | Journal of Geophysical Research: Solid Earth | 摘要: | Ambient noise interferometry is a powerful technique to continuously measuring crustal seismic velocity changes (dv/v) and studying crustal behaviors over time. However, the interpretation of such dv/v variations is not straightforward since multiple causes including internal (tectonic/magmatic) processes of the crust and external (environmental) factors could both affect dv/v simultaneously. To differentiate the interplay between the internal and external processes in dv/v variations is an essential step toward accurate crustal monitoring. In this study, we apply the single-station cross-component (SC) method to 15 selected stations from the Broadband Array in Taiwan for Seismology (BATS) to investigate the temporal evolution of crustal seismic velocities across Taiwan. We process the continuous BATS seismic recording from 1998 to 2019, construct the daily SC correlation functions, and compute dv/v values by the stretching technique in a frequency band of 0.1–0.9?Hz. We observe both strong annual dv/v variations and co-seismic velocity drops associated with regional moderate-to-large earthquakes. Systematic spectral and time-series analyses with the weather data suggest that the rainfall-induced pore-pressure change plays a predominant role in driving the dv/v seasonality, reflecting a diffusion process from meteoric water into shallow crust. The effects of other factors are relatively local and secondary. We also demonstrate how understanding and correcting rainfall effects could critically improve the resolution and accuracy of internal crustal damage related to earthquakes. ? 2021. American Geophysical Union. All Rights Reserved. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85119859209&doi=10.1029%2f2021JB022650&partnerID=40&md5=7b76082afcd1040256f3e9b9af3ee33d https://scholars.lib.ntu.edu.tw/handle/123456789/606248 |
ISSN: | 21699313 | DOI: | 10.1029/2021JB022650 |
顯示於: | 地質科學系 |
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