利用GRACE和GNSS测量评估尼泊尔喜马拉雅地区季节性水文负荷对大地运动和地震活动的影响

IF 2.8 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Devendra Shashikant Nagale , Suresh Kannaujiya , Param K. Gautam , Ajay K. Taloor , Tandrila Sarkar
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引用次数: 0

摘要

喜马拉雅地形是持续的汇聚和大地形变的缩影,在这里,构造和非构造力量都占主导地位。本文利用重力恢复与气候实验(GRACE)和全球定位系统(GPS)数据集,评估了季节性载荷对尼泊尔地震活动变形的影响。利用2017-2020年全球导航卫星系统(GNSS) 21个站点的GPS记录数据,在ITRF14和印度参考框架下进行处理,并采用2002-2020年空间研究中心(CSR) mascon RL06估算恒河-雅鲁藏布江流域陆地储水量(TWS)变化。结果表明:水文负荷效应或TWS变化在季风前、季风同季和季风后分别表现为高负、高正和中等正值;利用各GNSS站点的Pearson相关系数,将水平和垂直分量的去趋势GPS数据与TWS的季节变化进行相关性分析。此外,利用距离逆加权法插值相关系数,研究了TWS对区域大地位移的影响。北分量的相关系数在−0.6 ~ 0.6之间。同时,TWS与大地位移在东部分量呈正相关(0.82),在垂直分量呈负相关(- 0.69)。负相关表明季节TWS变化与大地位移呈反比关系。对应变率进行了估计,季风前应变率的负值大于季风后应变率的负值。季风前、同季风和季风后对地震活动性的影响分别为47.90%、15.97%和17.56%。由此可以推断,地震活动性随季节水文负荷的增加而减小。此外,季风前的应变效应远高于季风后的应变效应,因为季风后季节同季风的影响在小范围内持续存在。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impact assessment of the seasonal hydrological loading on geodetic movement and seismicity in Nepal Himalaya using GRACE and GNSS measurements

The Himalayan terrain is an epitome of ongoing convergence and geodetic deformation where both tectonic and non-tectonic forces prevail. In this study, the Gravity Recovery and Climate Experiment (GRACE) and Global Positioning System (GPS) datasets are used to assess the impact of seasonal loading on deformation with seismicity in Nepal. The recorded GPS data from 21 Global Navigation Satellite System (GNSS) stations during 2017–2020 are processed with respect to ITRF14 and the Indian reference frame, and the Center for Space Research (CSR) mascon RL06 during 2002–2020 is adopted to estimate the terrestrial water storage (TWS) change over the Ganga-Brahmaputra River basin. The results indicate that the hydrological loading effect or TWS change shows high negative, high positive, and moderately positive values in pre-monsoon, co-monsoon, and post-monsoon months, respectively. The detrended GPS data of both horizontal and vertical components correlate with the seasonal TWS change using the Pearson correlation coefficient at each GNSS site. In addition, the correlation coefficient has been interpolated using inverse distance weighting to investigate the regional TWS influence on geodetic displacement. In the north component, the correlation coefficient ranges from −0.6 to 0.6. At the same time, the TWS is positively correlated with geodetic displacement (0.82) in the east component, and the correlation coefficient is negative (−0.69) in the vertical component. The negative correlation signifies an inverse relationship between seasonal TWS variation and geodetic displacements. The strain rate is estimated, which shows higher negative values in pre-monsoon than in post-monsoon. Similarly, the effect of seismicity is 47.90% for pre-monsoon, 15.97% for co-monsoon, and 17.56% for post-monsoon. Thus we can infer that the seismicity decreases with the increase of seasonal hydrological loading. Furthermore, the effect of strain is much higher in pre-monsoon than in post-monsoon since the impact of co-monsoon continues to persist on a small scale in the post-monsoon season.

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来源期刊
Geodesy and Geodynamics
Geodesy and Geodynamics GEOCHEMISTRY & GEOPHYSICS-
CiteScore
4.40
自引率
4.20%
发文量
566
审稿时长
69 days
期刊介绍: Geodesy and Geodynamics launched in October, 2010, and is a bimonthly publication. It is sponsored jointly by Institute of Seismology, China Earthquake Administration, Science Press, and another six agencies. It is an international journal with a Chinese heart. Geodesy and Geodynamics is committed to the publication of quality scientific papers in English in the fields of geodesy and geodynamics from authors around the world. Its aim is to promote a combination between Geodesy and Geodynamics, deepen the application of Geodesy in the field of Geoscience and quicken worldwide fellows'' understanding on scientific research activity in China. It mainly publishes newest research achievements in the field of Geodesy, Geodynamics, Science of Disaster and so on. Aims and Scope: new theories and methods of geodesy; new results of monitoring and studying crustal movement and deformation by using geodetic theories and methods; new ways and achievements in earthquake-prediction investigation by using geodetic theories and methods; new results of crustal movement and deformation studies by using other geologic, hydrological, and geophysical theories and methods; new results of satellite gravity measurements; new development and results of space-to-ground observation technology.
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