| 利用重力资料监测日本9.0级大震激发的球型自由振荡 |
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| 引用本文： | 周建华,蔡丽雯,张玉莲.利用重力资料监测日本9.0级大震激发的球型自由振荡[J].高原地震,2014,26(3):42-46. |
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| 作者姓名： | 周建华 蔡丽雯 张玉莲 |
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| 作者单位： | 1. 甘肃省地震局天水中心地震台,甘肃天水,741020
2. 青海省地震局,青海西宁,810001 |
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| 基金项目： | 青海省工程地震研究院基金 |
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| 摘 要： | 利用攀枝花南山地震台重力观测资料,检测了2011年日本9.0级大地震激发的0S0～0S39之间基频球型自由振荡,其中有0S0、0S11、0S13、0S22、0S23、0S30、0S35等7个振型观测频率与理论值偏差近似为0,0S2、0S32、0S38、0S39振型频谱不突出,观测效果不明显。观测值与理论值整体平均偏差约为0.10%,观测效果较好,说明了PREM模型理论的正确性,肯定了南山地震台重力资料质量的优良。
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| 关 键 词： | 南山地震台 日本9.0级地震 重力资料 地球自由振荡 |
DETECTING THE FREE OSCILLATIONS OF THE EARTH EXCITED BY THE JAPAN M9.0 EARTHQUAKE USING OF GRAVITY OBSERVATIONS OF NANSHAN SEISMIC STATION |
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| ZHOU Jianhua,CAI Liwen,ZHANG Yulian.DETECTING THE FREE OSCILLATIONS OF THE EARTH EXCITED BY THE JAPAN M9.0 EARTHQUAKE USING OF GRAVITY OBSERVATIONS OF NANSHAN SEISMIC STATION[J].Plateau Earthquake Research,2014,26(3):42-46. |
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| Authors: | ZHOU Jianhua CAI Liwen ZHANG Yulian |
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| Institution: | ZHOU Jianhua,CAI Liwen,ZHANG Yulian( 1. Tianshui Center Seismic Station, Earthquake Administration of Gansu Province, Tianshui 741020, China ; 2. Earthquake Administration of Qinghai Province, Xining 810000, China) |
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| Abstract: | By using the digital observations of gravimeter at Nanshan Seismic Station,we extracted 39 spherical modes of0S0～0S39of the earth＇s free oscillation excited by the Japan M9. 0 earthquake in 2011. The deviations between0S0、0S11、0S13、0S22、0S23、0S30、0S35and their theoretical values are almost zero,however,it is difficult to identify the mode of0S2、0S32、0S38、0S39because they are drowned in the noises. The whole mean deviation is about 0. 10%,which can show that there is a good agreement between observed and theoretical values.Such findings mean that the excellent gravity data quality of Nanshan Seismic Station,as well as the validity of PREM model. |
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| Keywords: | Nanshan Seismic Station Japan M9 0 earthquake Free oscillations of the earth Gravity observations |
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