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Far-field coseismic gravity changes related to the 2015 MW7.8 Nepal(Gorkha)earthquake observed by superconducting gravimeters in Chinese mainland

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Earth and Planetary Physics 2021年第2期5卷 141-148页

作者： lelin xing ZiWei Liu JianGang Jia ShuQing Wu ZhengSong Chen XiaoWei Niu Innovation Academy for Precision Measurement Science and Technology Chinese Academy of SciencesWuhan 430077China State Key Laboratory of Geodesy and Earth’s Dynamics Chinese Academy of SciencesWuhan 430077China Hubei Earthquake Agency Wuhan 430071China School of Geodesy and Geomatics Wuhan UniversityWuhan 430079China National Institute of Metrology ChinaBeijing 100029China

Using data from five SGs at four stations in Chinese mainland,obvious permanent gravity changes caused by the 2015 MW7.8 Nepal(Gorkha)earthquake were *** analyzed the gravity effects from ground vertical deformation(VD)using co-site continuous GPS(cGPS)data collocated at the Lijiang and the Wuhan station,and hydrological effects using GLDAS models and groundwater level *** removing these effects,SG observations before and after the earthquake revealed obvious permanent gravity changes:−3.0μGal,7.3μGal and 8.0μGal at Lhasa,Lijiang and Wuhan station,*** found that the gravity changes cannot be explained by the results of dislocation theory.

关键词： the 2015 Nepal earthquake superconducting gravimeter coseismic gravity change

A new and high-precision gravity base network in the south of the Tibetan Plateau

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Geodesy and Geodynamics 2020年第4期11卷 258-264页

作者： lelin xing Lei Bai Xiaowei Niu Peng Sang Innovation Academy for Precision Measurement Science and Technology Chinese Academy of SciencesWuhan430077China State Key Laboratory of Geodesy and Earth's Dynamic Chinese Academy of SciencesWuhan430077China

A new gravity base network in the south of the Tibetan Plateau was established with a FG5X absolute gravimeter and three CG-6 *** gravity base network consists of 10 absolute gravity points and 17 relative gravity *** of the absolute data,pre-processing of the relative data and gravity network adjustment model are briefly *** a constrained weighted least squares,the combined adjustment of absolute and relative gravity measurements results in the gravity values with a precision of about±4.1μGal.

关键词： Tibetan plateau Gravity datum Gravity network adjustment

Three-dimensional admittance analysis of lithospheric elastic thickness over the Louisville Ridge

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Earthquake Science 2016年第2期29卷 117-125页

作者： Minzhang Hu Hui Li Chongyang Shen lelin xing Hongtao Hao Key Laboratory of Earthquake Geodesy Institute of SeismologyChina Earthquake Administration

Using bathymetry and altimetric gravity anomalies, a 1°×9 1° lithospheric effective elastic thickness（Te） model over the Louisville Ridge and its adjacent regions is calculated using the moving window admittance technique. For comparison, three bathymetry models are used： general bathymetric charts of the oceans, SIO V15.1,and BAT_VGG. The results show that BAT_VGG is more suitable for calculating T e than the other two models. T e along the Louisville Ridge was re-evaluated. The southeast of the ridge has a medium Te of 10–20 km, while Te increases dramatically seaward of the Tonga-Kermadec trench as a result of the collision of the Pacific and IndoAustralian plates.

关键词： Three-dimensional admittance analysis Lithospheric effective elastic thickness Bathymetry Gravity Louisville Ridge

Gravity variation in the Tibet area before the Nepal Ms8.1 earthquake

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Geodesy and Geodynamics 2016年第6期7卷 425-431页

作者： Hongtao Hao lelin xing Ziwei Liu YUfei Han Hui Li Key Laboratory of Earthquake Geodesy Institute of SeismologyChina Earthquake AdministrationWuhan430071China Wuhan Base of Institute of Crustal Dynamics China Earthquake AdministrationWuhan430071China National Earthquake Infrastructure Service Beijing100045China

This research utilized two periods of gravity monitoring results from 2010 to 2013 from the Continental Tectonics Environmental Monitoring Network of China, analyzed the corre- lation between gravity variation in the Tibet area and the Nepal Ms8.1 earthquake, and investigated the gravity variation mechanism in combination with the crust vertical movement and horizontal strain field observed by Global Positioning System （GPS）. The research results indicated that （1） the gravity variation exhibited apparent characteristics of a positive anomaly and high gradient zone in the Himalayan frontier. This observation is consistent with the existing recognition of the gravity anomaly and occurrence regularity of a strong earthquake; （2） the gravity variation exhibited apparent consistence with the spacious distribution of the vertical movement and the horizontal deformation field in that area. The crustal vertical movement was not the direct cause leading to the gravity vari- ation. It is assumed that the crust stress-strain accumulation in the Qinghai-Tibetan Plateau and its adjacent areas is the important factor that resulted in the variation of gravity.

关键词： Continental Tectonics Environ-mental Monitoring Network ofChinaNepal Ms8.1 earthquakeGravity variationCrustal deformation

Gravity Change Caused by Heavy Rainfall Detected by A gPhone Gravimeter in Zhengzhou， China

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Journal of Earth Science 2021年

作者： lelin xing YuFei Han XiaoWei Niu Lei Bai Innovation Academy for Precision Measurement Science and Technology， Chinese Academy of Sciences State Key Laboratory of Geodesy and Earth's Dynamics， Chinese Academy of Sciences China Earthquake Networks Center University of Chinese Academy of Sciences

The short-term effect of heavy rainfall on gPhone gravimeter observation at Zhengzhou seismic station is investigated. According to the observation data during 2021-07-17～07-20， the corrected gravity residual reflects the gravimetric response caused by heavy rainfall. The observed gravity change is dominated by the local effect considering topographic effect on gravity. The deduced water depth near the observation station is about 300 mm.

关键词： gravity gravity change heavy rain gravimeter gPhone

Gravity variation before the Akto Ms6.7 earthquake, Xinjiang

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Geodesy and Geodynamics 2017年第2期8卷 136-140页

作者： Hongtao Hao lelin xing Minzhang Hu Yufei Han Hui Li Key Laboratory of Earthquake Geodesy Institute of Seismology China Earthquake Administration Wuhan 430071 China Wuhan Base of Institute of Crustal Dynamics China Earthquake Administration Wuhan 430071 China National Earthquake Infrastructure Service Beijing 100045 China

The relationship between gravity variation and the Akto Ms6.7 earthquake on November 11, 2016, was studied by use of mobile gravity observation data from the China continental structural environmental monitoring network. The result revealed that before the Akto earthquake, a high positive gravity variation was observed in the Pamir tectonic knots region （within a maximum magnitude of approximately ＋80 microgal）, which was consistent with the existing knowledge of gravity abnormality and the locations of strong earthquakes. In view of the recent strong seismic activities in the Pamir tectonic knots region, as well as the strong upward crust movement and compressive strain, it is believed that gravity change in the Pamir tectonic knots region reflects the recent strong seismic activities and crust movement.

关键词： The continental tectonics environmental monitoring network of China Gravity variation Akto earthquake

Comparison of Absolute Gravity Measurements Obtained with FG5/232 and FG5/214 Instruments

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Geo-Spatial Information Science 2009年第4期12卷 307-310页

作者： xing lelin LI Hui LI Jiancheng HE Zhitang Institute of Seismology and Crustal Movement Laboratory China Earthquake Administration 40 Hongshance Road Wuhan 430071 China School of Geodesy and Geomatics Wuhan University 129 Luoyu Road Wuhan 430079 China

This paper introduces the comparison of absolute gravity measurements in China during 2006-2008,and analyzing the survey and comparing the results,it shows that there is no obvious system error between the gravimeter of FG5/214 and FG5/232,the surveying accuracy is very high and repetition is good,and their inner surveying accuracy is about 2-3 microGal.

关键词： comparison absolute gravity surveying gravity change earthquake

Gravity change observed in a local gravity network and its implication to seasonal precipitation in Dali county, Yunnan province, China

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Earthquake Science 2014年第1期27卷 79-88页

作者： Xin Zhou Wenke Sun Hui Li Shuhei Okubo Shaoan Sun lelin xing Dongzhi Liu Chongyang Shen Laboratory of Computational Geodynamics University of Chinese Academy of Sciences Institute of Seismology China Earthquake Administration Earthquake Research Institute The University of Tokyo

This study investigates data-processing methods and examines the precipitation effect on gravity measurements at the Dali gravity network, established in 2005. High-quality gravity data were collected during four measurement campaigns. To use the gravity data validly, some geophysical corrections must be considered carefully. We first discuss data-processing methods using weighted least- squares adjustment with the constraint of the absolute gravity datum. Results indicate that the gravity precision can be improved if all absolute gravity data are used as constraints and if calibration functions of relative gravi- meters are modeled within the observation function. Using this data-processing scheme, the mean point gravity pre- cision is better than 12 μgal. After determining the best data-processing scheme, we then process the gravity data obtained in the four measurement campaigns, and obtain gravity changes in three time periods. Results show that the gravity has a remarkable change of more than 50 pgal in the first time period from Apr-May of 2005 to Aug-Sept of 2007. To interpret the large gravity change, a mean water mass change （0.6 m in height） is assumed in the ETOPO1 topographic model. Calculations of the precipitation effect on gravity show that it can reach the same order of the observed gravity change. It is regarded as a main source of the remarkable gravity change in the Dali gravity network, suggesting that the precipitation effect on gravity mea- surements must be considered carefully.

关键词： Gravity network Gravity change Gravity datum Weighted constraint Precipitationeffect

Seasonal gravity changes estimated from GRACE data

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Geodesy and Geodynamics 2010年第1期1卷 57-63页

作者： Zhengbo Zou Hui Li Zhicai Luo lelin xing School of Geodesy and Geodynamics Wuhan University Wuhan 430079 China Institute of Seismology China Earthquake Administration Wuhan 430071 China Crustal Movement Laboratory Wuhan 430071 China

Since 2002, the GRACE program has provided a large amount of high-precision data, which can be used to detect temporal gravity variations related to global mass re-distribution inside the fluid envelop of the surface of the Earth. In order to make use of the GRACE data to investigate earthquake-related gravity changes in China, we first studied the degree variances of the monthly GRACE gravity field models, and then applied decorrelation and Gaussian smoothing method to obtain seasonal gravity changes in China. By deducting the multi-year mean seasonal variations from the seasonal maos,we found some earthouake-related gravity anomalies.

关键词： GRACE earthquake gravity variations decorrelation Gaussian smoothing.