Deep Well Seismology at Parkfield, CA: Sensor Array and Microearthquake Wave VSP

美国地质调查局正在打开5030英尺深的 瓦里安A-1井，东南4公里的预期震中， 下一次帕克菲尔德地震 建议NSF将此井 配备了4部分传感器阵列进行基础研究 小地震的特征和 圣安地列斯断层带 设计、安装、数据 该项目的数据收集和数据分析将由 加州大学圣塔芭芭拉分校与 加州大学伯克利分校。 传感器阵列将由 （1）“超低频”井下压力传感器， 1赫兹地震仪在井底，（2）一套8“低 频率”，2-hz 3分量万向地震检波器组件，间距为 200-沿井沿着米间隔，（3）一组8个“高频”， 20米处4.5hz三分量压力套管地震计组件 井底部附近的间隔，以及（4）一套8“超 高频”1000-hz单分量2米加速度计 也靠近井底。 在目前 建议，UCSB寻求资金建设和水泥阵列， 井。 我们建议的另一个单独部分是， 收集微震数据并分析微震垂直 地震剖面记录在阵列的“低频”部分。 为其他项目的数据收集和分析供资的请求 阵列的部分将由UCB单独提交。

The United States Geological Survey is opening the 5030-ft-deep Varian A-1 well, 4 km southeast of the expected epicenter of the next Parkfield earthquake. It is proposed to NSF that this well be instrumented with a 4-part sensor array to conduct basic research into the character of small earthquakes and the physical properties of the San Andreas Fault Zone. The design, installation, data collection, and data analysis for this project will be conducted by University of California, Santa Barbarba in collaboration with University of California, Berkeley. The sensor array will consist of: (1) an "ultra low frequency" downhole pressure transducer and 1-hz seismometer at the bottom of the well, (2) a set of 8 "low frequency", 2-hz 3-component gimbled seismometer packages spaced at 200-meter intervals along the well, (3) a set of 8 "high frequency", 4.5-hz 3-component pressure-cased seismometer packages at 20-meter intervals near the bottom of the well, and (4) a set of 8 "ultra high frequency" 1000-hz 1-component accelerometers at 2-meter intervals, also near the bottom of the well. In this present proposal, UCSB seeks funds to construct and cement the array into the well. An additional but separate part of our proposal is to collect microearthquake data and analyze microearthquake Vertical Seismic Profiles recorded on the "low frequency" part of the array. Requests for funding of data collection and analysis for the other parts of the array will be submitted in separate proposals by UCB.