Ground motion prediction equations based on shallow crustal earthquakes in Georgia and the surrounding Caucasus

IF 1.2 4区地球科学 Q3 Earth and Planetary Sciences

Earthquake Science Pub Date : 2022-12-01 DOI:10.1016/j.eqs.2022.12.001

Jorjiashvili Nato, Shengelia Ia, Godoladze Tea, Gunia Irakli, Akubardia Dimitri

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引用次数: 1

Abstract

Strong ground motions caused by earthquakes with magnitudes ranging from 3.5 to 6.9 and hypocentral distances of up to 300 km were recorded by local broadband stations and three-component accelerograms within Georgia’s enhanced digital seismic network. Such data mixing is particularly effective in areas where strong ground motion data are lacking. The data were used to produce models based on ground-motion prediction equations (GMPEs), one benefit of which is that they take into consideration information from waveforms across a wide range of frequencies. In this study, models were developed to predict ground motions for peak ground acceleration and 5%-damped pseudo-absolute-acceleration spectra for periods between 0.01 and 10 s. Short-period ground motions decayed faster than long-period motions, though decay was still in the order of approximately 1/r. Faulting mechanisms and local soil conditions greatly influence GMPEs. The spectral acceleration (SA) of thrust faults was higher than that for either strike-slip or normal faults but the influence of strike-slip faulting on SA was slightly greater than that for normal faults. Soft soils also caused significantly more amplification than rocky sites.

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基于格鲁吉亚及周边高加索地区浅层地壳地震的地震动预测方程

震级在3.5到6.9级之间，震源距离达300公里，由当地宽带站和格鲁吉亚增强数字地震网络中的三分量加速度计记录了地震引起的强烈地面运动。这种数据混合在缺乏强地面运动数据的地区特别有效。这些数据被用来建立基于地面运动预测方程(GMPEs)的模型，其中一个好处是它们考虑了宽频率范围内的波形信息。在这项研究中，建立了模型来预测地面运动的峰值地面加速度和5%阻尼的伪绝对加速度谱，周期在0.01到10秒之间。短周期地震动衰减速度快于长周期地震动，但衰减速度仍约为1/r。断裂机制和当地土壤条件对GMPEs影响很大。逆冲断层的谱加速度(SA)高于走滑断层和正断层，但走滑断层对SA的影响略大于正断层。软土也比岩石场地引起更大的放大。

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来源期刊

Earthquake Science GEOCHEMISTRY & GEOPHYSICS-

CiteScore

1.10

自引率

8.30%

发文量

审稿时长

3 months

期刊介绍： Earthquake Science (EQS) aims to publish high-quality, original, peer-reviewed articles on earthquake-related research subjects. It is an English international journal sponsored by the Seismological Society of China and the Institute of Geophysics, China Earthquake Administration. The topics include, but not limited to, the following ● Seismic sources of all kinds. ● Earth structure at all scales. ● Seismotectonics. ● New methods and theoretical seismology. ● Strong ground motion. ● Seismic phenomena of all kinds. ● Seismic hazards, earthquake forecasting and prediction. ● Seismic instrumentation. ● Significant recent or past seismic events. ● Documentation of recent seismic events or important observations. ● Descriptions of field deployments, new methods, and available software tools. The types of manuscripts include the following. There is no length requirement, except for the Short Notes. 【Articles】 Original contributions that have not been published elsewhere. 【Short Notes】 Short papers of recent events or topics that warrant rapid peer reviews and publications. Limited to 4 publication pages. 【Rapid Communications】 Significant contributions that warrant rapid peer reviews and publications. 【Review Articles】Review articles are by invitation only. Please contact the editorial office and editors for possible proposals. 【Toolboxes】 Descriptions of novel numerical methods and associated computer codes. 【Data Products】 Documentation of datasets of various kinds that are interested to the community and available for open access (field data, processed data, synthetic data, or models). 【Opinions】Views on important topics and future directions in earthquake science. 【Comments and Replies】Commentaries on a recently published EQS paper is welcome. The authors of the paper commented will be invited to reply. Both the Comment and the Reply are subject to peer review.