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中国地球物理学会第二十九届年会

作者： R. Tu R. Wang M. Ge T.R. Walter M. Ramatschi C. Milkereit D. Bindi T. Dahm gfz german research Center for geosciences

Real-time detection and precise estimation of strong ground motion are crucial for rapid assessment and early warning of geohazards such as earthquakes, landslides and volcanic activity. This challenging task can be accomplished by combining GPS and accelerometer measurements because of their complementary capabilities to resolve broadband ground motion signals. However, for implementing an operational monitoring network of such joint measurement systems, cost-effective techniques need to be developed and rigorously tested. We propose a new approach for joint processing of single-frequency GPS and MEMS （Micro-Electro-Mechanical Systems） accelerometer data in real time. To demonstrate the performance of our method, we describe results from outdoor experiments under controlled conditions. For validation, we analyzed dual-frequency GPS data and images recorded by a video camera. The results of the different sensors agree very well, suggesting that real-time broadband information of ground motion can be provided by using single-frequency GPS and MEMS accelerometers.

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鄂尔多斯盆地东南部陆相延长组页岩油气生成及相态演化特征

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鄂尔多斯盆地东南部陆相延长组页岩油气生成及相态演化特征

推动地质科技创新，支撑找矿突破实践，服务美丽中国建设——中国地质学会2013年学术年会

作者：韩双彪张金川 Brian Horsfield 唐玄 Nicolaj Mahlstedt School of Energy Resources China University of Geosciences german research centre for geosciences (gfz) Potsdam

近年来,美国实现了海相地层页岩气的重大突破,页岩油气的勘探开发逐渐成为世界各国的关注焦点,这一非常规资源正改变着全球的能源格局(EIA,2013)。2012年首次页岩气资源潜力评价结果显示,我国页岩气地质资源潜力为134.42万亿立方米(不... 详细信息

近年来,美国实现了海相地层页岩气的重大突破,页岩油气的勘探开发逐渐成为世界各国的关注焦点,这一非常规资源正改变着全球的能源格局(EIA,2013)。2012年首次页岩气资源潜力评价结果显示,我国页岩气地质资源潜力为134.42万亿立方米(不含青藏区),陆相页岩气占总量的26.23%(张大伟,2012),其中鄂尔多斯盆地东南部的中生界三叠系湖相延长组页岩已有工业性油气流产出。页岩油气具有自生自

关键词：鄂尔多斯延长组页岩油气,生烃相态演化

Remote sensing ionospheric variations due to total solar eclipse, using GNSS observations

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Geodesy and Geodynamics 2020年第3期11卷 202-210页

作者： Mohamad Mahdi Alizadeh Harald Schuh Saeed Zare Sahar Sobhkhiz-Miandehi Lung-Chih Tsai Dept.of Geodesy and Geomatics Eng. K.N.Toosi University of TechnologyTehranIran Inst.of Geodesy and Geoinformation Science Technical University of BerlinBerlinGermany Dept.1:Geodesy GFZ German Research Center for GeosciencesPotsdamGermany Center for Space and Remote Sensing research National Central UniversityChung-LiTaiwanChina GPS Application and research Center National Central UniversityChung-LiTaiwanChina

For years great interest has been taken in the effects of physical phenomena on ionosphere structure. A total solar eclipse was visible in North America on August 21 st, 2017. This event offered a great opportunity for remote sensing the ionospheric behavior under the eclipse condition. In this study we investigated the effects of total solar eclipse on variations of Total Electron Content(TEC), and consequently deviations on regional models of Vertical TEC(VTEC), as well as variations in ionospheric scintillation occurrence. Although variations of TEC due to total solar eclipse are studied thoroughly by many authors, but the effect of solar eclipse on ionospheric scintillation has never been considered before. Our study is based on measurements from a high-rate GPS network over North America on the day of eclipse, a day before and after its occurrence, on the other hand, GPS measurements from groundbased stations on similar days were used to model TEC on the day of event, and also one day before and after it. The results of this study demonstrate that solar eclipse reduced scintillation occurrence at the totality region up to 28 percent and TEC values showed a decrease of maximum 7 TECU. Considering TEC models, our study showed apparent variations in the regional models, which confirms previous studies on ionospheric responses to eclipse as well as theoretical assumptions.

关键词： Ionosphere Solar eclipse Remote sensing Ionospheric scintillation Total electron content GPS measurements

监测二氧化碳地质储存的地电方法——德国Ketzin CO2SINK试验场地跨孔及地面-井下测量取得的初步成果

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水文地质工程地质技术方法动态 2011年第3期 20-32页

作者： Dana Kiesslinga 何雪洲（翻译） Helmholtz centre Potsdam GFZ German Research Centre for Geosciences Centre for CO2 Storage Telegrafenberg 14473 PotsdamGermany 不详

用跨孔以及地面-井下电阻率层析成像（ERT）、监测深度约650米咸水含水层中二氧化碳（CO2）迁移的可行性调查在Ketzin（德国）附近的CO2SINK实验场地进行。永久性的垂直电阻率排列（VERA）由45根电极组成（15根在注入井Ketzin201内，两... 详细信息

用跨孔以及地面-井下电阻率层析成像（ERT）、监测深度约650米咸水含水层中二氧化碳（CO2）迁移的可行性调查在Ketzin（德国）附近的CO2SINK实验场地进行。永久性的垂直电阻率排列（VERA）由45根电极组成（15根在注入井Ketzin201内，两口观测井Ktzi200和Ktzi202内各15根），成功地放置在约590-740米（电极距约10米）深度范围的绝缘套管上。该Ketzin的三口井排列成垂直三角形，孔间距50和100米。第一个合成模拟研究指出，二氧化碳注入引起大约200％的电阻率增加（与大部分二氧化碳50％的饱和度相对应），这同实验室的研究比较一致。场地资料的有限差分反演在井孔之间提供了与储层模拟研究一致的电阻率三维分布。为了扩大跨孔测量提供的有限观测面积，另外布置了地面－井下测量。从地面到井下的电阻率实验推导出一个东南-西北方向的主要二氧化碳的迁移。第一个跨孔时延成果指出，Ketzin电极排列设置的分辨率和覆盖范围足以解决期望的关于该电极排列在特征长度尺寸上的电阻率变化。有可能测量到大的电阻率变化，但是，在当前的地质情况下，用垂直电阻率排列还不能解决二氧化碳羽状流的详细资料。

关键词：电阻率层析成像(ERT) 地电监测二氧化碳储存野外数据埋设电报

Integration of GNSS and seismic data for earthquake early warning: A case study on the 2011 Mw 9.0 Tohoku-Oki Earthquake

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Integration of GNSS and seismic data for earthquake early wa...

第五届中国卫星导航学术年会

作者： Bofeng Guo Xiaohong Zhang Xingxing Li School of Geodesy and Geomatics Wuhan University german research centre for geosciences (gfz)

Earthquake early warning (EEW), which is considered to be a pragmatic and viable way to reduce the damage and casualties during a large earthquake, relies on the accurate estimation of broadband displacements and the capability of rapidly detection of the first arrival wave (P-wave). Real-time high-rate GNSS is a reliable tool to directly capture displacements including static offsets and dynamic motions at the near field, which does not suffer from the clip, rotation and tilt problems as the traditional seismic instrument does. However, due to the large high-frequency noise and the low sampling rates of GNSS measurements, it is hard to pick up the P-wave arrival accurately in GNSS-derived displacement history. To overcome this problem, the combination of high-rate GNSS and collocated accelerometers shows promise as a more reliable and effective way, because accelerometers perform very well with high precision in the high-frequency range. In this study, we investigate the method by using collocated GNSS and accelerometers for EEW. We first introduce a new approach, namely the temporal point positioning (TPP) method, which could directly obtain coseismic displacement with a single GNSS receiver in real-time. The TPP method overcome the convergence problem of precise point positioning (PPP), and also avoids the integration process of the Variometric approach. And then we apply a multi-rate Kalman filter to fuse GNSS-derived coseismic displacement with collocated accelerometer data for attaining integrated displacements with a high precision and reliability. Finally, we detect the arrival time of P-wave and determine the earthquake magnitude from the integrated results. The performance of collocated GNSS and accelerometers is validated using data from GEONET (1 Hz GPS) and K-NET/KiK-Net (100 Hz accelerometer) stations, with the collocated distance less than 2 km, in the near field of the Mw 9.0 Tohoku-Oki earthquake occurred on March 11, 2011. Using the broadband displacements derived by the above method, we detect

关键词： temporal point positioning earthquake early warning real-time high-rate GNSS accelerometer integrated displacement.

亚暴期间电离层场向电流的分布特征--CHAMP卫星观测

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地球物理学报 2010年第6期53卷 1256-1262页

作者：王慧毛丹丹马淑英 H. Luehr 武汉大学电子信息学院空间物理系武汉430079 中国科学院空间天气学国家重点实验室北京100190 Helmholtz centre Potsdam- gfz German Research Center for GeosciencesD-14473 PotsdamGermany

场向电流在不同的等离子体区之间传递能量、动量和质量,是磁层与电离层之间的关键耦合过程.本文利用CHAMP卫星高精度的空间磁场测量数据,研究亚暴期间极区电离层场向电流的统计学分布特征.研究表明场向电流的大小与所在位置呈现明显的... 详细信息

场向电流在不同的等离子体区之间传递能量、动量和质量,是磁层与电离层之间的关键耦合过程.本文利用CHAMP卫星高精度的空间磁场测量数据,研究亚暴期间极区电离层场向电流的统计学分布特征.研究表明场向电流的大小与所在位置呈现明显的日夜和晨昏不对称性,具体为:(1)场向电流的大小与亚暴极光电急流指数(AL)密切相连,AL愈大,电流愈强,亚暴期间电流强度相对平静期来说可增加约5倍,昏侧和夜侧电流强度与AL指数的相关性较好,晨侧和白天侧两者相关性较差;(2)电流的峰值密度所在位置与AL指数的相关性不高,昏侧电流所处纬度低于晨侧,而夜晚电流所处纬度低于白天侧.

关键词：亚暴极区电离层场向电流 CHAMP卫星

Combined Multifactor Evidence of a Giant Lower-Mantle Ring Structure below the Eastern Mediterranean

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Positioning 2020年第2期11卷 11-32页

作者： Lev Eppelbaum Zvi Ben-Avraham Youri Katz Sierd Cloetingh Mikhail Kaban Department of geosciences Faculty of Exact Sciences Tel Aviv University Ramat Aviv Tel Aviv Israel Steinhardt Museum of Natural History & National research Center Faculty of Life Sciences Tel Aviv University Ramat Aviv Tel Aviv Israel Faculty of geosciences Utrecht University TA Utrecht The Netherlands Helmholtz-centre Potsdam GFZ German Research Centre for Geosciences Telegrafenberg Potsdam Germany Schmidt Institute of Physics of the Earth RAS Moscow Russia

In the Arabian-Northern African region, interaction of the Nubian, Arabian and Eurasian plates and many small tectonic units is conspicuous. In order to better understand this interaction, we use satellite derived gravity data (retracked to the Earth’s surface) recognized now as a powerful tool for tectono-geodynamic zonation. We applied the polynomial approximation to the gravity data which indicated the presence of a large, deep ring structure in the eastern Mediterranean centered below the Island of Cyprus. Quantitative analysis of residual gravity anomaly provides an estimate of the deep anomalous body’s upper edge at a depth of about 1700 km. Computations of the residual gravity anomalies for the lower mantle also indicate presence of anomalous sources. The GPS vector pattern coinciding with the gravity trend implies?counter clockwise rotation of this structure. Independent analyses of the geoid isolines map and seismic tomography data support the existence of a deep anomaly. Paleomagnetic data analysis from the surrounding regions confirms a?counter clockwise rotation. Numerous petrological, mineralogical, geodynamical and tectonic data suggest a relation between this deep structure and near-surface processes. This anomaly sheds light on a number of phenomena including the Cyprus gravity anomaly, counter clockwise rotation of the Mesozoic terrane belt and asymmetry of basins along continental transform faults.

关键词： Satellite Gravity Geodynamics Tectonics Paleomagnetism GPS Integrated Analysis

Three-dimensional virtual representation for the whole process of dam-break floods from a geospatial storytelling perspective

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International Journal of Digital Earth 2022年第1期15卷 1637-1656页

作者： Weilian Li Jun Zhu Jan-Henrik Haunert Lin Fu Qing Zhu Youness Dehbi Faculty of geosciences and Environmental Engineering Southwest Jiaotong UniversityChengduPeople's Republic of China Institute of Geodesy and Geoinformation University of BonnBonnGermany

The objective of disaster scenes is to share location-based risk information to a large audience in an effective and intuitive way.However,current studies on three-dimensional(3D)representation for dam-break floods have the following limitations:(1)they are lacking a reasonable logic to organize the whole process of dam-break floods,(2)they present information in a way that cannot be easily understood by laypersons.Geospatial storytelling helps to create exciting experiences and to explain complex relationships of geospatial phenomena.This article proposes a three-dimensional virtual representation method for the whole process of dam-break floods from a geospatial storytelling perspective.The creation of a storyline and a storytelling-oriented representation of dam-break floods are discussed in detail.Finally,a prototype system based on WebGL is developed to conduct an experiment analysis.The results of the experiment show that the proposed method can effectively support 3D representation of the spatiotemporal process of dam-break floods.Furthermore,the statistical results indicate that the storytelling is useful for assisting participants in understanding the occurrence and development of dam-break floods,and is applicable to the popularization of disaster science for the general public.

关键词： Geospatial storytelling dam-break flood spatiotemporal process virtual representation 3D scene

Automatic inversions of strong-motion records for finite-fault ruptures of earthquakes in Japan

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Automatic inversions of strong-motion records for finite-fau...

2019年中国地球科学联合学术年会

作者： Xujun Zheng Yong Zhang Rongjiang Wang School of Earth and Space Sciences Peking University Helmholtz centre Potsdam gfz german research centre for geosciences

Automatic and rapid imaging of earthquake rupture process is a difficult task but critical for post-earthquake response and possible tsunami early warnings. We develop an automatic system for the i

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Complex Effective Relative Permittivity of Soil Samples from the Taunus Region (germany)

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Journal of Earth Science 2010年第6期21卷 961-967页

作者： Katja Lauer Christian Albrecht Christina Salat Peter Felix-Henningsen Institute of Soil Science and Soil Conservation Research Centre for BioSystems Land Use and Nutrition (IFZ) Justus-Liebig-University Giessen Department of Underground Space for Storage and Economic Use Federal Institute for Geosciences and Natural Resources

The most important parameter affecting ground-penetrating radar （GPR） measurements is the complex effective relative permittivity εr^＊,eff because it controls the propagation velocity and the reflection of GPR pulses. Knowing εr^＊,eff of soils passed through by electromagnetic waves increases accuracy in soil thickness and interface identification. Complex effective relative permittivity εr^＊,eff= εr^＊,eff - jεr^＊,effof 25 soil samples with textures ranging from loamy sand to silty clay was measured using the two-electrode parallelplate method. The measurements were conducted at defined water contents for frequencies from 1 MHz to 3 GHz. The results confirm the frequency dependence of εr^＊,eff and show that the dielectric behavior of soil-water mixtures is a function of water content. Applying the experimental data of this study with predictions based on the empirical model by Toppet aL （1980）, we find that Topp et aL＇s curve tends to underestimate the real part of εr^＊,eff measured. Along with frequency and water content, soil texture and organic matter affect soil permittivity. Moreover, the real part of εr^＊,eff increases at higher dry bulk densities. Output from our calibration model enables us to predict εr^＊,eff for the soil samples which were tested under the actual in situ soil water content. This results in high accuracy of soil thickness prediction.

关键词： ground-penetrating radar （GPR） complex effective relative permittivity soil sample.