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首页> 外文期刊>Pure and Applied Geophysics >Characteristics of Radiation and Propagation of Seismic Waves in Northern Finland, Estimated Based on Records of Local Earthquakes
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Characteristics of Radiation and Propagation of Seismic Waves in Northern Finland, Estimated Based on Records of Local Earthquakes

机译：芬兰北部地震波辐射及繁殖特征，估计基于局部地震的记录

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摘要

The characteristics of radiation and propagation of seismic waves required in various seismological applications, especially in seismic hazard assessment, are estimated in northern Finland based on records of local earthquakes (80 records from four stations, M(w)1.5 to 4.1, h3 to 25km). Northern Finland possesses relatively low seismic activity; however, rather strong earthquakes occurred there in the past. We applied coda-normalization method to estimate the quality factor Q(f)Q(0)f(n) and then verified and corrected the Q(f) estimates at low frequencies by stochastic simulations. We obtained Q(0)80 to 100, n1.1 to 1.2 for hypocentral distances of20 to 150km, and Q(0)180 to 350, n0.7 to 0.9 for hypocentral distances of150 to 320km. Other parameters were estimated by the empirical methods and stochastic simulation of local earthquakes (M-L2.0). We estimated the stress drop (sigma 200 bars), geometrical spreading (as a two-segment function: 1/R for R0 to 80km and 1/80 for R80 to 300km), the duration of seismic motion depending on the hypocentral distance, kappa value (0.001 to 0.03s), and some other parameters. The obtained high estimates of the stress drop, along with rather high Q values, may result in noticeably increased (compared to those that could be expected on average) PGA estimates in seismic hazard assessment in northern Finland.
机译：在各种地震应用中所需的辐射和繁殖的特点，特别是在地震危险评估中，估计在芬兰北部，基于当地地震的记录（来自四个站的80个记录，M（w）1.5至4.1，H3至25km ）。芬兰北部具有相对较低的地震活动;然而，过去发生了相当强烈的地震。我们应用了CoDa-归一化方法来估计质量因子Q（F）Q（0）F（n），然后通过随机模拟验证并校正低频下的Q（f）估计。我们获得了Q（0）80至100，N1.1至1.2，用于20至150km的斜视距离，Q（0）180至350，N0.7至0.9，用于150至320km的斜视距离。通过局部地震的经验方法和随机模拟估计其他参数（M-L＆GT; 2.0）。我们估计压力下降（Sigma 200 Bars），几何扩展（作为双段功能：1 / R对于R0至80km，R80至300km的1/80），因此地震运动的持续时间根据斜视距离，kappe值（0.001至0.03s）和一些其他参数。所获得的应力下降的高估计值以及相当高的Q值可能导致芬兰北部地震危害评估中的平均估计的显着增加（相比。

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