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首页> 外文期刊>Earth, planets and space: EPS >Geographical variations of the 0S0 normal mode amplitude: predictions and observations after the Sumatra-Andaman earthquake
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Geographical variations of the 0S0 normal mode amplitude: predictions and observations after the Sumatra-Andaman earthquake

机译：0S0正模振幅的地理变化：苏门答腊-安达曼地震后的预测和观察

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The radial seismic normal mode 0S0 was strongly excited by the 2004 Mw = 9.3 Sumatra-Andaman earthquake at a period of 20.5 min. In a spherically symmetric Earth model, 0S0 amplitude is the same everywhere on the Earth's surface. However, when the ellipticity and rotation of the Earth are taken into consideration, theoretical computations predict an amplitude of 0S0 1% higher at the pole than at the equator. Based on a realistic three-dimensional heterogeneous rotating elliptic Earth model, our predictions indicate that the amplitude of 0S0 is 2% higher at the pole than at the equator. A longitude dependency of 0S0 amplitude is also shown. The analysis of 13 superconducting gravimeter (SG) records of the 2004 Sumatra-Andaman earthquake supports the predicted geographical variations of 0S0 amplitude. We have also obtained new estimates for the frequency and Q of 0S0: 0.8146566±1.6 10-6 mHz and 5506±19.
机译：2004年Mw = 9.3的苏门答腊-安达曼地震在20.5分钟的时间段强烈激发了径向地震正常模式 0 S 0 。在球对称地球模型中， 0 S 0 的振幅在地球表面各处都相同。但是，考虑到地球的椭圆率和自转，理论计算预测，在极点处的 0 S 0 的振幅比赤道处的振幅高1％。根据现实的三维异质旋转椭圆地球模型，我们的预测表明， 0 S 0 的振幅在极点处比在赤道处高2％。还显示了 0 S 0 幅度的经度依赖性。对2004年苏门答腊-安达曼地震的13条超导重力仪（SG）记录的分析支持了 0 S 0 振幅的预测地理变化。我们还获得了 0 S 0 的频率和Q的新估计：0.8146566±1.6 10 -6 mHz和5506±19。

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