Forecasting temporal variation of aftershocks immediately after a main shock using Gaussian process regression
Forecasting temporal variation of aftershocks immediately after a main shock using Gaussian process regression
复制标题
使用高斯过程回归预测主震后余震的时间变化
DOI:
10.1093/gji/ggab124
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发表时间:
2021
影响因子:
2.8
通讯作者:
and N. Hirata
中科院分区:
文献类型:
--
作者:
Morikawa;K.;H. Nagao;S. Ito;Y. Terada;S. Sakai;and N. Hirata
Uncovering the distribution of magnitudes and arrival times of aftershocks is a key to comprehending the characteristics of earthquake sequences, which enables us to predict seismic activities and conduct hazard assessments. However, identifying the number of aftershocks immediately after the main shock is practically difficult due to contaminations of arriving seismic waves. To overcome this difficulty, we construct a likelihood based on the detected data, incorporating a detection function to which Gaussian process regression (GPR) is applied. The GPR is capable of estimating not only the parameters of the distribution of aftershocks together with the detection function, but also credible intervals for both the parameters and the detection function. The property that the distributions of both the Gaussian process and aftershocks are exponential functions leads to an efficient Bayesian computational algorithm to estimate hyperparameters. After its validation through numerical tests, the proposed method is retrospectively applied to the catalogue data related to the 2004 Chuetsu earthquake for the early forecasting of the aftershocks. The results show that the proposed method stably and simultaneously estimates distribution parameters and credible intervals, even withint≤ 3 hr after the main shock.
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DOI:
--
发表时间:
2018-02
期刊:
ArXiv
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影响因子:
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