气候变化领域集成服务门户(CCPortal): Precision Seismic Monitoring and Analysis at Axial Seamount Using a Real-Time Double-Difference System

CCPortal

DOI	10.1029/2019JB018796
	Precision Seismic Monitoring and Analysis at Axial Seamount Using a Real-Time Double-Difference System
	Waldhauser F.; Wilcock W.S.D.; Tolstoy M.; Baillard C.; Tan Y.J.; Schaff D.P.
发表日期	2020
ISSN	21699313
卷号	125 期号:5
英文摘要	Seven three-component ocean bottom seismometers (OBS) of the Ocean Observatories Initiative (OOI) Cabled Array on top of Axial Seamount are continuously streaming data in real time to the Incorporated Research Institutions for Seismology (IRIS). The OBS array records earthquakes from the submarine volcano which last erupted on 24 April 2015, about 4 months after the array came online. The OBS data have proven crucial in providing insight into the volcano structure and dynamics (Wilcock et al., 2016, https://doi.org/10.1126/science.aah5563). We implemented a real-time double-difference (RT-DD) monitoring system that automatically computes high-precision (tens of meters) locations of new earthquakes. The system's underlying double-difference base catalog includes nearly 100,000 earthquakes and was computed using kurtosis phase onset picks, cross-correlation phase delay times, and 3-D P and S velocity models to predict the data. The relocations reveal the fine-scale structures of long-lived, narrow (<200 m wide), outward dipping, convex faults on the east and west walls of the caldera that appear to form a figure 8-shaped ring fault system. These faults accommodate stresses caused by the inflation of magma prior to and deflation during eruptions. The east fault is segmented and pulled apart in east-west direction due to its interaction with the Juan de Fuca Ridge, which at this location forms an overlapping spreading center. The RT-DD system enables the monitoring and rapid analysis of variations in fine-scale seismic and fault properties and has the potential to improve prediction of timing and location of the next Axial eruption expected to occur in the 2022–2023 time frame. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Axial volcano; dikes; precision seismic monitoring; ring faults; seismicity; volcanic eruption
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187851
作者单位	Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; School of Oceanography, University of Washington, Seattle, WA, United States
推荐引用方式 GB/T 7714	Waldhauser F.,Wilcock W.S.D.,Tolstoy M.,et al. Precision Seismic Monitoring and Analysis at Axial Seamount Using a Real-Time Double-Difference System[J],2020,125(5).
APA	Waldhauser F.,Wilcock W.S.D.,Tolstoy M.,Baillard C.,Tan Y.J.,&Schaff D.P..(2020).Precision Seismic Monitoring and Analysis at Axial Seamount Using a Real-Time Double-Difference System.Journal of Geophysical Research: Solid Earth,125(5).
MLA	Waldhauser F.,et al."Precision Seismic Monitoring and Analysis at Axial Seamount Using a Real-Time Double-Difference System".Journal of Geophysical Research: Solid Earth 125.5(2020).