Seismic network design to detect felt ground motions from induced seismicity
Seismic network design to detect felt ground motions from induced seismicity
复制标题
用于检测诱发地震活动产生的有感地面运动的地震网络设计
DOI：
10.1016/j.soildyn.2013.01.030
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发表时间：
2013
影响因子：
4
通讯作者：
J. Douglas
中科院分区：
文献类型：
--
作者：
J. Douglas
人类活动，例如作为刺激增强地热系统（EGS）以产生热量和电力的一部分而注入液体，可能会导致破坏性的地震地面运动。快速解决或拒绝 EGS 运营商保单的保险索赔的一个困难是缺乏在报告损坏地点观察到的震动的基本事实。为了克服这个问题，可以在注入之前安装局部地震网络，以限制潜在损坏点的地面运动场。由于地震仪的安装和维护成本高昂，因此有动力将仪器的数量保持在最低限度。在这种简短的通信中，模拟地面运动场并进行接收器操作特性分析，以指导决定所需的传感器数量，以获得对误报和漏检率的一定置信度。对于每平方公里 10-20 个仪器的密度，估计潜在破坏性地面运动的能力是合理的，但与漏检和误报的可能性很大有关。如果 EGS 运营商或监管机构不想接受这种机会，则需要每平方公里 50-100 个仪器的网络密度，即使在这种情况下，也不能完全限制超过/不超过某个地面运动阈值。
Human activities, such as fluid injection as part of the stimulation of an enhanced geothermal system (EGS) for heat and power production, can cause damaging earthquake ground motions. A difficulty in quickly settling or rejecting insurance claims to the policy of the EGS operator is the lack of ground truth on the observed shaking at sites of reported damage. To overcome this problem a local seismic network could be installed prior to injection to constrain the ground-motion field at points of potential damage. Since the installation and maintenance of seismometers are costly there is an incentive to keep the number of instruments to a minimum. In this short communication, ground-motion fields are simulated and receiver operating characteristic analysis is conducted to guide decisions on the number of sensors required to obtain a certain confidence in the rate of false alarms and missed detections. For densities of 10–20 instruments per km2the ability to estimate potentially damaging ground motions is reasonable but associated with a significant chance of missed detections and false alarms. If an EGS operator or regulatory authority does not want to accept such chances then network densities of 50–100 instruments per km2are required and even in this case the exceedance/non-exceedance of a certain ground-motion threshold cannot be completely constrained.