| 美国新马德里地震带的震间应变积累 |
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| 引用本文： | 刘澜波,陆燕萍.美国新马德里地震带的震间应变积累[J].地球物理学报,1995,38(6):757-766. |
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| 作者姓名： | 刘澜波 陆燕萍 |
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| 作者单位： | 1. 美国华盛顿卡奈基研究院地磁部, 哥伦比亚特区 20015；;
2. 美国斯坦福大学地球物理系, 加利福尼亚州 94305 |
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| 摘 要： | 使用全球定位系统（ＧＰＳ）卫星接收仪在美国新马德里地震带重新测量了历史上的三角网，并据此估算了震间应变速率．使用的观测资料包括５０年代初期在这个地区２０多个测站上获取的三角测量数据，以及在这些测站上于１９９１年和１９９３年所取得的ＧＰＳ测量数据．在整个网内的平均应变速率为每年０．１４１±０．０２５微应变．最大主压缩轴方向为ＮＥ８９°±６°．这一实测平均应变速率的数量级与考古地震研究和地震活动速率关于大地震重复周期在新马德里地区大约为５００－１０００ａ的估计相吻合．在美国中部进行的原地应力测量指出，该地区的最大主任应力轴为ＮＥＥ向，本文关于最大主压缩轴方向的结果与此相－致．
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| 关 键 词： | 新马德里地震带 全球定位系统 板内地震 震间应变速率 |
| 收稿时间： | 1994-11-17 |
INTERSEISMIC STRAIN ACCUMULATION IN THE NEW MADRID SEISMIC ZONE |
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| LIU LAN-BO.INTERSEISMIC STRAIN ACCUMULATION IN THE NEW MADRID SEISMIC ZONE[J].Chinese Journal of Geophysics,1995,38(6):757-766. |
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| Authors: | LIU LAN-BO |
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| Institution: | 1. Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washingion, D, C, 20015;
2. Department of Geophysics, Stanford University, Stanford, California 94305 |
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| Abstract: | Results of interseismic strain rate determined by re-occupation of a historical triangulation network in the New Madrid seismic zone by the Global Position System（GPS）are reported.The data used in this analysis include triangulation observations at more than twenty stations acquired in early 1950s and GPS observations surveyed in 1991 and 1993.The average shear strain rate is about 0.14±0.03 microradian/year.The orientation of the maximun contraction is approximately 89°±6°.The magnitude of this observed Interseismic strain rate is consistent with the recurrence rate of major earthquakes of 500-1000 years in the New Madird seismic zone inferred from paleoseismological and seismlcity studies.And the orientation of the maximum shortening is consistent with the east-northeast to east-west orientation of the horizontal principal axis of the regional tectonic stress in central and eastern United states. |
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| Keywords: | New Madrid seismic zone Global Positioning System(GPS) Intraplate earthquakes Interseismic strain rate |
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