Development of Stacking Method for the Detection of Crustal Deformation
Development of Stacking Method for the Detection of Crustal Deformation
复制标题
地壳形变检测叠加方法的发展
DOI：
10.4294/zisin.65.205
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
T. Yokota
中科院分区：
文献类型：
--
作者：
K. Miyaoka;T. Yokota
日本气象厅在静冈县、爱知县和长野县部署了应变仪，目的是探测在板块边界预计发生的8级大地震之前预计会发生的缓慢滑动现象。本文提出了一种叠加方法，它是将不同测站的数据按下列步骤叠加。首先，在每个站的观测波形由噪声水平归一化。然后，如果需要，通过考虑假定的源位置反转极性，以信噪比的量级一个接一个地堆叠归一化波形，使得信号全部为正。当叠加波形的合成信噪比变为最大时，停止该叠加过程。如果假定源的位置不同，则给出最大信噪比的最佳数据集中的成员变得不同。结果表明，用该方法得到的叠加波形的信噪比比最有利的单个数据提高了2.3倍。如果在预期的东海地震的震源区内发生一个小到Mw 5.0的慢滑动事件，将被检测到。我们认为叠加方法不仅适用于应变仪数据，而且适用于GNSS和倾斜仪数据，这种方法的扩展可能会有效地检测火山下方的岩浆上升。
The Japan Meteorological Agency has deployed strain-meters in Shizuoka, Aichi, and Nagano Prefectures, aiming to detect a slow slip phenomenon that is expected to occur just before the anticipated great earthquake of M8 class at the plate boundary. In this paper we propose a stacking method in which data at diff erent stations are added according to the following procedure. First, the observed waveform at each station is normalized by the noise level. Then, the normalized wave form is stacked one by one in the order of the magnitude of the signal to noise ratio, by reversing the polarity considering an assumed source location, if necessary, so as the signal to be all positive. This stacking procedure is stopped when the synthesized signal to noise ratio of the stacked waveform becomes the maximum. Members in the optimum data set that gives the largest signal to noise ratio become diff erent if the location of the assumed source is diff erent. It is shown that the signal to noise ratio of the stacked waveform obtained by this method is enhanced 2.3 times of that of the most favorable individual data. A slow slip event as small as Mw 5.0 would be detected if it occurs within the source area of the anticipated Tokai earthquake. We think the stacking method is applicable not only to the strain-meter data, but also to the GNSS and tilt-meter data and such an extension of the method may be eff ective to detect rising of magma beneath volcanoes.
影响因子：
3
作者：
Y. Okada
通讯作者：
Y. Okada
H.264编码器DCT的硬件实现及其评估
DOI：
--
发表时间：
2009
期刊：
影响因子：
--
作者：
Choong Geun Lee;V. G. Moshnyaga and K. Hashimoto;宮田康治
通讯作者：
宮田康治
影响因子：
56.9
作者：
Obara, K
通讯作者：
Obara, K