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首页> 外文期刊>Seismological research letters >A Very Close Look at a Moderate Earthquake near Sudbury, Ontario
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A Very Close Look at a Moderate Earthquake near Sudbury, Ontario

机译：仔细观察安大略省萨德伯里附近的中度地震

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摘要

A shallow moderate earthquake of MN (Nuttli magnitude) 4.1occurred near Sudbury, Ontario, at 07:22:55 UTC (02:22:55local time) on 29 November 2006. The event was located 6km from Lively, Ontario, and was induced by mining activ-ity at Inco's Creighton mine. Inco's in-mine monitoring sys-tem, and its subsequent visual inspection, places the event at46.478 N 81.203 W, at a depth of 2.35 km. This event offersus a rare close-up view of a moderate earthquake, because itwas recorded at close distances by five three-component broad-band POLARIS (Portable Observatories for LithosphericAnalysis and Research Investigating Seismicity; http://www.polarisnet.ca) seismographic stations that are installed aboveand within the Creighton mine. Two stations are located onthe surface, near the epicenter, while three subsurface stationsare at depths of 1 to 2 km. The closest station to the event iswithin the Sudbury Neutrino Observatory (SNO) lab, which is2 km beneath the surface and about 300 m above the event. Theevent caused no damage to the SNO lab and only minor dam-age to the mine workings; there were no injuries. The event waswidely felt in the Sudbury, Ontario, region, as expected basedon instrumental ShakeMaps (http://www.shakemap.carleton.ca) and confirmed by Internet intensity reports (http://www.earthquakescanada.ca). The mainshock was followed by twosignificant aftershocks at 2:36 (MN 2.0) and 2:38 (MN 3.1)local time and by many smaller aftershocks. In addition to thenear-source records, this event was well-recorded regionally atdistances from 20 km to hundreds of kilometers by the seis-mographic stations of the Canadian National Seismographic Network (CNSN) and POLARIS. Figure 1 shows the locationof the Lively event in relation to regional seismographic sta-tions; the nearest regional station is SUNO, 22 km away. In thispaper we provide a preliminary examination of the recordedground motions from this event and discuss their implicationsfor our understanding of source and attenuation properties ineastern North America (ENA).
机译：2006年11月29日世界标准时间07:22:55（当地时间02:22:55）在安大略省萨德伯里附近发生了MN（Nuttli级）浅度中度地震4.1。该事件位于距安大略省Lively 6公里的地方通过在Inco的Creighton矿进行开采活动。 Inco的矿内监控系统及其后续的目视检查将事件定位在46.478 N 81.203 W处，深度为2.35 km。此事件为我们提供了罕见的中度地震近景，因为它是由五个三分量宽带POLARIS（便携式岩石圈分析和研究地震台; http：//www.polarisnet.ca）地震记录在近距离处的安装在Creighton煤矿上方和内部的电站。在地面上，震中附近有两个测站，而三个地下测站位于1至2 km的深度。距事件最近的站位于萨德伯里中微子天文台（SNO）实验室内，该实验室位于地面以下2公里处，距事件约300 m。该事件未对SNO实验室造成任何损害，仅对矿山运营造成了轻微损坏;没有受伤。根据工具性ShakeMaps（http://www.shakemap.carleton.ca）的预期，该事件在安大略省萨德伯里（Sudbury）受到了广泛的关注，并被Internet强度报告（http://www.earthquakescanada.ca）证实。主震之后是当地时间2:36（MN 2.0）和2:38（MN 3.1）的两次重大余震，还有许多较小的余震。除了后来的震源记录外，加拿大国家地震台网（CNSN）和POLARIS的地震台站还记录了该事件从20 km到数百km的区域距离。图1显示了与区域地震台站有关的热闹事件的位置;最近的区域车站是SUNO，22公里。在本文中，我们对从该事件记录的地面运动进行了初步检查，并讨论了它们对我们了解北美东部（ENA）的震源和衰减特性的影响。

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