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The Cape Ann, Massachusetts earthquake of 1755: A 250th anniversary perspective

机译:1755年马萨诸塞州安因角地震:250周年纪念日

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The earthquake of November 18, 1755, was experienced over a wide area along the East Coast of North America. It caused considerable damage to masonry chimneys and walls in eastern Massachusetts, eastern New Hampshire, and southern Maine. A reexamination of the felt reports, immediate aftershocks and modern seismicity indicate that the most likely epicenter was about 40 km ENE of Cape Ann, Massachusetts, within a cluster of recent earthquake epicenters. Based on the attenuation of MMI with epicentral distance, the Lg-wave magnitude of the earthquake was about M-lg 96.2, corresponding to a moment magnitude of M 5.9. From analyses using modern ground-motion attenuation relations, conversions from MMI, and estimations from the number and severity of damaged chimneys, it is estimated that in Boston this earthquake caused peak ground accelerations of about 0.08 g-0.12 g on soil sites, while the 5%-damped response spectral value at a period of 0.3 sec in Boston may have been as small as 0.09 g or as large as 0.21 g. The Boston ground-motion estimates in this study correspond approximately to the 5% in 50 yr ground motions on the 1996 and 2002 USGS National Seismic Hazard Maps.
机译:1755年11月18日的地震在北美洲东海岸的大范围内发生。它对马萨诸塞州东部,新罕布什尔州东部和缅因州南部的砌体烟囱和墙壁造成了相当大的破坏。对毛毡报告,立即余震和现代地震活动的重新检查表明,最有可能的震中是在马萨诸塞州安普角的大约40 km ENE,在最近的地震震中群集中。基于震中距MMI的衰减,地震的Lg波震级约为M-lg 96.2,对应的震级为M 5.9。根据使用现代地面运动衰减关系进行的分析,MMI的转换以及损坏的烟囱的数量和严重性的估计,估计在波士顿,这次地震在土壤位点引起了大约0.08 g-0.12 g的峰值地面加速度,而在波士顿,在0.3秒内衰减5%的响应光谱值可能小到0.09 g或大到0.21 g。在这项研究中,波士顿的地面运动估计大约相当于1996年和2002年USGS国家地震危险性地图上50年地面运动的5%。

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