Earthquake detection capacity of the Dense Oceanfloor Network system for Earthquakes and Tsunamis (DONET)

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Seismology Pub Date : 2024-06-06 DOI:10.1007/s10950-024-10219-2
K. Z. Nanjo, Y. Yamamoto, K. Ariyoshi, H. Horikawa, S. Yada, N. Takahashi
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Abstract

We studied the earthquake detection capacity of DONET (Dense Oceanfloor Network system for Earthquakes and Tsunamis) operating in the Nankai Trough, a target region monitored for future megathrust earthquakes. The focus of this paper was to evaluate the impact on this capacity from the malfunction of parts of the network. For this purpose, the completeness magnitude, above which all earthquakes are considered to be detected by a seismic network, was used. Then, a catalog that includes events observed by DONET was used. We found spatiotemporal variability of completeness magnitude, ranging from values below 1 in one of the areas where stations are densely deployed to values above 2 at the periphery and outside of the DONET area. We conducted a simulation computation for cases of malfunction of densely distributed stations. The results showed that completeness estimates in the area near the malfunctioning stations were about 1 magnitude larger. This implies that malfunction repair and/or replacement with new stations would be desirable because they pronouncedly affect earthquake monitoring. We then demonstrated an example of how to use the information of completeness magnitude as prior knowledge to compute the b value of the Gutenberg-Richter distribution. The result indicates the b value as a proxy that can help to image stress heterogeneity when there is a magnitude-6 class slow slip event on the Nankai Trough plate boundary.

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地震和海啸密集洋底网络系统(DONET)的地震探测能力
我们研究了在南海海槽运行的 DONET(地震和海啸密集洋底网络系统)的地震探测能力,南海海槽是未来特大地壳地震的监测目标区域。本文的重点是评估部分网络故障对这一能力的影响。为此,本文使用了完整性量级,即地震台网检测到的所有地震均超过该量级。然后,使用包含 DONET 观测到的事件的目录。我们发现完整度的时空变化很大,从密集布设台站的一个地区的低于 1 到 DONET 区域外围的高于 2 不等。我们对密集布设的台站出现故障的情况进行了模拟计算。结果表明,故障台站附近区域的完整性估计值要高出约 1 个量级。这意味着故障修复和/或更换新台站是可取的,因为它们会明显影响地震监测。然后,我们举例说明了如何利用完好性震级信息作为先验知识来计算古腾堡-里克特分布的 b 值。结果表明,当南海海槽板块边界发生 6 级慢速滑动事件时,b 值作为一种替代值可帮助映射应力异质性。
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来源期刊
Journal of Seismology
Journal of Seismology 地学-地球化学与地球物理
CiteScore
3.30
自引率
6.20%
发文量
67
审稿时长
3 months
期刊介绍: Journal of Seismology is an international journal specialising in all observational and theoretical aspects related to earthquake occurrence. Research topics may cover: seismotectonics, seismicity, historical seismicity, seismic source physics, strong ground motion studies, seismic hazard or risk, engineering seismology, physics of fault systems, triggered and induced seismicity, mining seismology, volcano seismology, earthquake prediction, structural investigations ranging from local to regional and global studies with a particular focus on passive experiments.
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