RAPID: Monitoring Deep Crustal Earthquake Sequence, Sierraville, California
RAPID:监测深部地壳地震序列,加利福尼亚州塞拉维尔
基本信息
- 批准号:1202664
- 负责人:
- 金额:$ 2.22万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2012
- 资助国家:美国
- 起止时间:2012-01-01 至 2013-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The project is to establish a temporary telemetered broadband array to monitor an energetic and unique Moho-depth earthquake sequence that began in southern Sierra Valley, California, in August 2001. The sequence is confined to 30-36 km depths and is remarkably similar to a sequence of earthquakes under North Lake Tahoe in 2003, about 45 km southeast of Sierra Valley. To date, ~1000 earthquakes have been located in the 2011 Sierra Valley sequence. High-resolution event locations from both sequences show that each lies on a ~N45W ~50 NE dipping structure; one long-period (LP) event has been identified along the structure, yet was not within either swarm location. The process, now observed in a second sequence, is interpreted to represent diking and weakening of a high strength upper mantle Moho cap by injection of a lower density melt defining a fundamental boundary between the Sierra Nevada microplate and the Basin and Range. In both sequences, seismicity is confined to a 5-6 km depth range and magma progresses upward at very similar rates in both sequences. Periodic increases in activity are most likely related to enhanced injection within the overall diking process. The new data provides the most comprehensive measurements of Moho-depth earthquake swarms within the Sierran block. An October 26th Mw 4.7 earthquake, felt throughout the region, occurred at 15 km depth, the brittle-ductile transition depth, directly above the deep swarm. Based on upper crustal seismicity associated with the 2003 deep swarm, we could expect additional shallow seismicity; the shallow triggered seismicity is related either to fluids propagating from depth or deformation associated a Moho depth strain event. Broadband instrumentation is in place to capture shallow crustal activity that may precede additional M 4.5 earthquakes. High-density broadband data complement regional monitoring and local GPS measurements to address fundamental questions about and evolution of the Sierra Nevada microplate boundary in the northern Sierra region. No broadband stations were in place during the 2003 sequence, and increased station density and sensor bandwidth in 2011 provides the data to better observe Moho and lower crustal volcanic processes associated with the swarm. Several faults in the region are capable of M ~7 earthquakes. Detailed observations of the processes provides the basis for coordinated efforts between the University of Nevada Reno, the U.S. Geological Survey, and California Emergency Management Administration in preparedness and gauged notification measures for citizens in the eastern California area.
该项目将建立一个临时遥测宽带阵列,以监测2001年8月开始于加州塞拉谷南部的一次强烈而独特的莫霍深度地震序列。该序列仅限于30-36公里深,与2003年北湖下的地震序列非常相似,位于塞拉谷东南约45公里处。 到目前为止,在2011年塞拉山谷序列中已经定位了大约1000次地震。 两个层序的高分辨率事件位置显示,每个都位于~ N45 W ~50 NE倾斜构造上;沿该构造沿着识别出一个长周期(LP)事件,但不在任一震群位置内。 这个过程,现在观察到的第二个序列,被解释为代表筑堤和削弱高强度上地幔莫霍面帽注入低密度熔体定义之间的基本边界的塞拉利昂内华达州微板块和盆地和山脉。 在这两个序列中,地震活动被限制在5-6公里的深度范围内,岩浆在两个序列中以非常相似的速率向上进展。活动的周期性增加很可能与整个筑堤过程中的强化注入有关。 新的数据提供了Sierran块体内Moho深度地震群的最全面测量。 10月26日,整个地区都能感觉到一次Mw 4.7的地震,地震发生在15公里深的地方,即脆韧性过渡深度,直接位于深震群上方。 基于与2003年深震群相关的上地壳地震活动,我们可以预期额外的浅层地震活动;浅层触发地震活动与从深度传播的流体或与莫霍面深度应变事件相关的变形有关。 宽带仪器已就位,以捕捉可能发生在其他M4.5地震之前的地壳浅层活动。高密度宽带数据补充区域监测和当地GPS测量,以解决有关北方Sierra地区的Sierra内华达州微板块边界及其演变的基本问题。 2003年序列期间没有宽带台站,2011年台站密度和传感器带宽的增加为更好地观察莫霍面和与群相关的下地壳火山过程提供了数据。 区内几条断裂具有发生7级地震的能力。对这些过程的详细观察为内华达州里诺大学、美国地质调查局和加州应急管理局之间的协调努力提供了基础,以便为加州东部地区的公民做好准备并采取计量通知措施。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Kenneth Smith其他文献
The calculation of atomic collision processes
- DOI:
- 发表时间:
1971 - 期刊:
- 影响因子:1.4
- 作者:
Kenneth Smith - 通讯作者:
Kenneth Smith
From natural order to convention in silent gesture
从自然秩序到约定俗成的无声姿态
- DOI:
- 发表时间:
2016 - 期刊:
- 影响因子:0
- 作者:
M. Schouwstra;Kenneth Smith;S. Kirby - 通讯作者:
S. Kirby
Is a holistic protolanguage a plausible precursor to language? A test case for a modern evolutionary linguistics
整体的原始语言是语言的合理先驱吗?
- DOI:
10.1075/is.9.1.02smi - 发表时间:
2008 - 期刊:
- 影响因子:1.5
- 作者:
Kenneth Smith - 通讯作者:
Kenneth Smith
Cumulative cultural evolution in a non-copying task in children and Guinea baboons
儿童和几内亚狒狒非复制任务中的累积文化进化
- DOI:
- 发表时间:
2019 - 期刊:
- 影响因子:0
- 作者:
Carmen Saldana;J. Fagot;S. Kirby;Kenneth Smith;N. Claidière - 通讯作者:
N. Claidière
The role of Gestalt principles in the acquisition of non-adjacent dependencies in linguistic and non-linguistic sequences
格式塔原理在语言和非语言序列中非相邻依赖性习得中的作用
- DOI:
- 发表时间:
2009 - 期刊:
- 影响因子:0
- 作者:
J. Sturm;Kenneth Smith - 通讯作者:
Kenneth Smith
Kenneth Smith的其他文献
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