ABSTRACT We analyse seismic data collected from a short-term array deployment in the low seismicity area of Dunedin city, New Zealand. The addition of this temporary network to the permanent GeoNet national seismic network allows detection of earthquakes not captured by the GeoNet network. Using one of the newly detected earthquakes as a master event, we employ a template match-filter analysis to identify similar events in the area. Specifically, we record a cluster of micro-events at the northern extent of the Akatore Fault (<15 km from the city centre). A recent paleoseismic study has shown the Akatore Fault to have had multiple earthquake ruptures in the late Holocene after over 110 ka of quiescence, so the observed microseismicity is consistent with the fault being in a state of elevated activity. In contrast, other known faults in the area are quiescent with respect to both microseismicity and Holocene ruptures. The establishment of a permanent seismic array in and around Dunedin for the monitoring of microseismicity on the Akatore Fault and other local faults is warranted.

中文翻译：

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表征低地震活动区的微地震活动：短期宽带地震阵列在新西兰但尼丁的应用

摘要 我们分析了从新西兰但尼丁市低地震活动区的短期阵列部署收集的地震数据。将此临时网络添加到永久 GeoNet 国家地震网络中，可以检测 GeoNet 网络未捕获的地震。使用新检测到的地震之一作为主事件，我们采用模板匹配过滤器分析来识别该地区的类似事件。具体而言，我们记录了 Akatore 断层北部（距市中心 <15 公里）的一系列微事件。最近的一项古地震研究表明，在超过 110 ka 的静止后，阿卡托雷断层在全新世晚期发生了多次地震破裂，因此观察到的微地震与断层处于活动增加的状态一致。相比之下，该地区的其他已知断层在微地震和全新世破裂方面都处于静止状态。有必要在但尼丁及其周围建立永久性地震阵列，以监测 Akatore 断层和其他局部断层的微地震活动。