globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116887
论文题名:
Seismicity and velocity structure in the vicinity of repeating slow slip earthquakes, northern Hikurangi subduction zone, New Zealand
作者: Mochizuki K.; Henrys S.; Haijima D.; Warren-Smith E.; Fry B.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 563
语种: 英语
中文关键词: bending-related faults ; dehydration process ; fluid distribution ; seismic velocity structure ; seismicity gap ; subduction zone seismicity
英文关键词: Earthquakes ; Fault slips ; Landforms ; Offshore oil well production ; Seismic waves ; Bending-related fault ; Dehydration process ; Fluid distribution ; New zealand ; Seismic velocity structure ; Seismicity gap ; Slow slip events ; Subduction zone seismicities ; Subduction zones ; Velocity structure ; Dehydration ; earthquake event ; earthquake magnitude ; normal fault ; oceanic crust ; seismic velocity ; seismicity ; strike-slip fault ; subduction zone ; velocity structure ; New Zealand
英文摘要: Using an 11-month (April 2012 to March 2013) deployment of Ocean Bottom Seismographs along the northern Hikurangi subduction zone, New Zealand, we located 2005 earthquakes (M 0.7-4.5) and obtained detailed 3-D Vp and Vs models for a region where a spectrum of subduction fault slip behavior is observed. Our analysis over a 120 × 110 km2 onshore-offshore area reveals high Vp/Vs (>1.8) in the subducting 10 km thick Hikurangi Plateau oceanic crust below an area of repeating slow slip events (SSEs), that are assumed to occur on the plate megathrust. Low Vp/Vs is mapped in a 15 km wide domain along the coastline, offshore Gisborne, marked by low Qs/Qp. Seismicity is absent from the core of high Vp/Vs anomalies (∼2.0) and within the band with lower Vp/Vs, but earthquakes are distributed vertically and are widespread in adjacent high Vp/Vs (∼1.85-1.95) regions along the trend of the coastline. Down-dip and along-strike variation of the Vp/Vs structure of the subducting Hikurangi Plateau could be the result of dehydration process caused by reactivated bending-related faults. Zones of vertical extensional fault–fracture in the subducting crust may act as conduits for the discharge of overpressured fluid and episodic hydrofracturing. During our deployment a large SSE (Mw6.8) occurred in February 2013. In response, seismicity became active in central Hawke Bay and at the down-dip edge of a previously mapped high-amplitude reflectivity zone. Microseismicity appeared synchronous with the slip propagation of the SSEs and may have been initiated by the slip. Our results hold implications for understanding of the physical environments conducive to slow slip generation and represent an important baseline for future seismicity work in the region. © 2021 The Author(s)
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165603
Appears in Collections:气候变化与战略

Files in This Item:

There are no files associated with this item.


作者单位: Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan; GNS Science, 1 Fairway Drive, Avalon 5010 PO Box 30-368, Lower Hutt, 5040, New Zealand; JX Nippon Oil & Gas Exploration Corporation, 1-1-2 Otemachi, Chiyoda-ku, Tokyo, 100-8163, Japan

Recommended Citation:
Mochizuki K.,Henrys S.,Haijima D.,et al. Seismicity and velocity structure in the vicinity of repeating slow slip earthquakes, northern Hikurangi subduction zone, New Zealand[J]. Earth and Planetary Science Letters,2021-01-01,563
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Mochizuki K.]'s Articles
[Henrys S.]'s Articles
[Haijima D.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Mochizuki K.]'s Articles
[Henrys S.]'s Articles
[Haijima D.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Mochizuki K.]‘s Articles
[Henrys S.]‘s Articles
[Haijima D.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.