Coordinated Deployment of Seismic Instruments to Record Aftershocks of the September 2010 New Zealand Earthquake

2010年9月4日，新西兰达菲尔德市发生地震，这是自1931年纳皮尔地震以来新西兰发生的最具破坏性的地震。虽然没有人丧生，但该地区的破坏范围很广，特别是附近的克赖斯特彻奇，经济损失预计将超过20亿新西兰元。这场地震在科学上也很有趣，而且在很多方面都令人惊讶。它发生在一个以前未绘制地图的断层上，该断层位于一个被认为风险低于其他地区的地区(例如阿尔卑斯断层)。复杂的震源时间函数表明，事件涉及两个或多个子喷发事件。最令人惊讶的方面之一是该事件沿一条近东西向断层的主要走滑特征。南岛构造以阿尔卑斯山断裂系统及其附近为主，主要是东北-西南走向的走滑断裂，如霍普断层。该项目的数据将提供一个独特的机会来研究一个很可能非常年轻和不成熟的断层，因此在性质上与成熟的断层如加利福尼亚州的圣安德烈亚斯断层或土耳其的安纳托利亚断层完全不同。新西兰和威斯康星大学麦迪逊分校的科学家已经部署了临时地震仪器来监测余震。新西兰的仪器是由GNS Science和维多利亚大学的工作人员部署的，分别由Terry Webb和Martha Savage领导。皮瑟伯安排了9台坡道仪器从IRIS/PASSCAL工厂运往克赖斯特彻奇，并派遣了2名威斯康星大学麦迪逊分校的工作人员到新西兰部署这些仪器。通过这次联合行动，将部署18台短周期、9台宽带和3台强震仪器。停机坪的部署将持续到2011年1月中旬。这些数据将在IRIS/PASSCAL“RAMP”部署所需的时间范围内提供给科学界。该项目将支持一名博士后参与部署，并促进与新西兰科学团队的合作。这项工作得到了国际科学与工程办公室和地球物理计划的共同支持。

The September 4, 2010, Darfield, New Zealand earthquake is the most damagingearthquake to strike New Zealand since the 1931 Napier Earthquake. Although no lives werelost, damage was extensive in the area, particularly in nearby Christchurch, and economic lossesare expected to total over NZ $2 billion. The earthquake is also scientifically interesting and inmany ways surprising. It occurred on a previously unmapped fault in an area that was presumedto have lower risks than other areas (e.g., the Alpine Fault). The complex source time functionindicates that two or more subevents were involved.One of the most surprising aspects is thepredominantly strike-slip character of the event along a nearly east-west fault. South Islandtectonics are dominated by the Alpine Fault system and nearby, mostly northeast-southweststriking strike slip faults, such as the Hope Fault. The data from this project will provide aunique opportunity to study a fault that is very likely quite young and immature, and thusfundamentally different in character from mature faults such as the San Andreas Fault inCalifornia or the Anatolian Fault in Turkey.New Zealand and UW-Madison scientists have deployed temporary seismic instrumentsto monitor aftershocks. The New Zealand instruments were deployed by GNS Science andVictoria University staff, led by Terry Webb and Martha Savage, respectively. PI Thurberarranged for the shipment of 9 RAMP instruments from the IRIS/PASSCAL facility toChristchurch and sent 2 UW-Madison staff to New Zealand to deploy them. 18 short-period, 9 broadband, and 3 strong motion instruments will be deployed through this joint endeavor. The RAMP deployment will continue until mid January 2011. The data will be made available to the scientific community within the time frame required for IRIS/PASSCAL "RAMP" deployments.The project will support a postdoctoral student to participate in the deployment, and foster a collaboration with scientific teams in New Zealand. This work is jointly supported by the Office of International Science and Engineering and the Geophysics program.