A5100602905- earthquake and tectonic studies
- Earthquake Detection and Analysis
- High-pressure geophysics and materials
- Landslides and related hazards
- Geological and Geochemical Analysis
- Seismology and Earthquake Studies
- Remote Sensing and Land Use
- Rock Mechanics and Modeling
- Synthetic Aperture Radar (SAR) Applications and Techniques
- 3D Surveying and Cultural Heritage
- Advancements in PLL and VCO Technologies
- BIM and Construction Integration
- Computational Geometry and Mesh Generation
- Evaluation and Optimization Models
- Advanced Decision-Making Techniques
- Seismic Performance and Analysis
- Analog and Mixed-Signal Circuit Design
- Geotechnical and Geomechanical Engineering
- Advanced Graph Theory Research
- Cryospheric studies and observations
- Data Management and Algorithms
- Sensor Technology and Measurement Systems
- Geophysics and Sensor Technology
Guilin University of Technology
2023
China Earthquake Administration
2011-2022
Institute of Geodesy and Geophysics
2013-2022
Zhejiang Normal University
2010
Heilongjiang Institute of Technology
2010
Abstract On 21 May 2021, an Mw 7.4 left-lateral strike-slip earthquake occurred within the Bayan Har block in Tibetan plateau. To learn about source rupture process, we collected teleseismic waveforms and utilized backprojection method to investigate kinematics of earthquake. The results indicate that was a bilateral event with asymmetric velocities. velocity east epicenter uniform range 2.72–3.67 km/s, whereas, west, it 1.39–1.78 km/s first 20 km then increased 2.82–3.17 km/s. slip...
Abstract Interferometric synthetic aperture radar and teleseismic P‐wave data were combined to investigate the source rupture characteristics of 2020 Mw 6.3 Yutian, China, earthquake. We first utilized near‐field displacements together with 29 broadband P waveforms uniform slip model by using a Bayesian bootstrap optimization nonlinear inversion method resolve nucleation point location, origin time fault geometrical parameters. Based on these results, kinematic process earthquake was...
The surrounding area of the Tarim Basin is featured by active tectonic deformation and intense seismic activity. study crustal characteristics this will help revealing role in evolution. In order to accurately obtain area, we firstly obtained highly detailed accurate three-dimensional (3D) velocities its areas through high-precision processing existing Global Positioning System (GPS) data. Thereafter, slip rate strain fields main faults region were calculated based on updated velocity...
SUMMARY On 28 September 2018, a Mw 7.5 strike-slip earthquake occurred in Sulawesi Island, Indonesia, and it unexpectedly triggered tsunami. To clearly understand the spatiotemporal evolution process of source rupture, we collected far-field body wave data utilized back-projection method together with finite fault inversion to investigate rupture kinematics this earthquake. Results obtained two methods have good consistency complementarity. We hold that expanded from epicentre propagated...
In this paper, the design of a new-style instrumentation amplifier based on chopper-stabilized technology is reported. It consists low power operational with TCMC structure, modulating and demodulating circuits two switches low-pass filter module which could reduce flicker noise effectively. By analysis optimization parasitic effects parameters, has better performance in every aspect. This simulation result shows that, case guaranteed bandwidth, can suppress interference At frequency gain 20...
Co-seismic ground-surface deformation of the Yushu earthquake on April 14, 2010 is studied basis interferometry principle by using InSAR images from ALOS PALSAR and ENVISAT ASAR pairs. The observed maximum line-of-sight displacement 54 cm, which equivalent to a sinistral strike slip 180 cm surface. location macro-epicenter very close epicenter determined in situ investigation, suggesting that an ideal tool for quick identification macro-epicenter, thus timely disaster assessment after...
The data of earthquake magnitude 3.5 or greater that happened during the 1970 and 2008 in Yunnan region (22 degrees 28 north, 98 104 east) were compiled analyzed this paper. After calculating seismicity indicators constructing initial set, AHC over sampling method was used on imbalanced data. Then small earthquakes large ones 1999 predicted verified with support vector machines (SVM) which contains different error cost. result performs well, it provides a new way for prediction.
Landslides significantly impact economic development and public safety. Aiming at the problem of insufficient prediction accuracy displacement data series traditional grey Verhulst model, this paper proposes a fractional model optimized using beetle tentacle search algorithm. First, based on order operator is introduced to accurately adjust magnitude between cumulative values, constructing order-based model. Expanding accumulative range improves performance. Second, optimized. The antennae...
The complex dynamics of baker's map and its variants in an infinite-precision mathematical domain have been extensively analyzed the past five decades. However, their real structure implemented a finite-precision computer remains unclear. This paper gives explicit formulation for quantized extension into higher dimensions. Our study reveals certain properties, such as in-degree distribution state-mapping network approaching constant with increasing precision, consistent maximum across...
2015年4月25日尼泊尔爆发MW7.9地震,继而引发5月12日MW7.3级余震,GPS、InSAR监测到震源区及周边大范围同震形变.本文以国内外的GPS和InSAR同震形变为约束,考虑喜马拉雅断裂带岩石圈垂向分层和横向差异的影响,反演主喜马拉雅逆冲断裂在这次主震和余震中破裂面形状和滑动分布.结果显示,主震从USGS确定的震中位置向东偏南延伸100 km以上,破裂地面迹线与主前缘逆冲断裂迹线基本一致.破裂面倾角约7°~11°,大部分破裂集中在深度8~20 km,同余震分布深度一致.主震最大滑动量约6.0~6.6 m,位于14 km深处.余震破裂集中在震中附近30 km范围内,填补了主震东部破裂空区,最大滑动约3.6~4.6 m,位于13 km深.深度20 km以下基本没有破裂.地壳介质不均匀性对破裂滑动分布的影响较大,介质不均匀模型的观测值不符值比各向同性弹性半空间模型降低10%以上.本文地震破裂模型特征与地震反射剖面、以及根据震间期大地测量数据反演的喜马拉雅深部蠕滑剖面极其相似.跨喜马拉雅断裂剖面的震间形变量与地震破裂滑移量直接相关.以此推算,尼泊尔中部大震原地复发周期在300年以上.
In this paper, the relationships of plunges and azimuths T P axes versus strikes, dips, rakes two seismic nodal planes were derived to provide reference for earthquake researchers. The independence T, B, in focal mechanism solution was discussed, it concluded that three parameters, i.e., B axes, are completely independent. representation based on Euler rotation introduced, using angles place representations briefly compared analyzed respect accuracy basis assumption rounding; angle has...
2020年7月22日（UTC）西藏尼玛发生MW6.3地震.为准确确定地震的发震断层、反演破裂滑动分布以及评估地震危险性，本文利用合成孔径雷达差分干涉（DInSAR）技术对Sentinel-1A/B数据进行处理，获取视线向（line of sight，LOS）同震形变场，形变场显示以沉降为主，长轴呈NE向，升、降轨最大沉降量分别为~30 cm和~26 cm.采用基于序列蒙特卡罗采样的贝叶斯方法反演发震断层的位置和几何参数，并在此基础上通过最速下降法反演同震破裂滑动分布.反演结果显示：发震断层走向~30.41°±1.25°，倾角~49.52°±1.06°，属东倾断层.震中位置为（86.89°E，33.18°N），对应深度7.23 km.同震破裂只存在一个滑动中心，主要集中在3.4~11.8 km深度，最大滑动量~0.98 m，平均滑动角-74.54°，表明本次地震是以正断为主兼具少量左旋走滑，释放地震矩约为3.86×1018N·m，对应矩震级MW6.36，略大于USGS（United States Geological Survey，美国地质调查局）提供的震级.对于深度5...
以陆态网络和尼泊尔境内高频(1 Hz)GPS观测数据为基础，采用动态双差相对定位方法，获取2015年尼泊尔MW7.8和MW7.3地震震时近场地表动态变形过程。结果表明，MW7.8地震震中东侧高频GPS站动态位移幅度明显大于震中西侧；各高频GPS站动态位移幅度不仅与测站震中距有关，而且与地震破裂传播方向有关；MW7.3地震引起的水平动态位移相对较小。将高频GPS与邻近强震仪动态位移时序进行对比发现，二者在振幅和相位上具有较好的一致性。
通过对尼泊尔MS8.1地震前后附近区域GPS台站记录到的观测数据进行处理，获得了震区以及中国青藏高原地区地震前后GPS站点速度场以及震后形变场。震前速度场显示，喜马拉雅构造带整体呈现出约16 mm/a的压缩特征。同时，震前喜马拉雅构造带根据形变特征可分为东、中、西3段，其地震发生在中段，主要以北向挤压为主，而东西两段分别具有逆时针旋转和顺时针旋转的特征。震后GPS站点形变场显示，此次地震对中国新疆、青海、西藏等地区的影响较大，其最大震后位移达20 mm左右。震后速度场显示，本次地震对尼泊尔地区以及中国藏南地区的构造形变影响较大，主要表现为喜马拉雅构造带的年推挤速度减小，藏南地区的南北向运动速率减小，而东西向速度有增大的现象。这一现象可能对藏南地区的走滑断层有较大影响。
处理尼泊尔境内及中国藏南的连续GPS数据，获得尼泊尔地震震后1 a的三维形变场。结果表明，震后形变主要发生在尼泊尔北部及中尼边境区域，水平形变以向南运动为主，垂直形变以隆升为主。采用有限断层模型反演的震后余滑分布范围十分广泛，主要集中在同震破裂下倾部分，向下延伸至30 km，平均余滑深度为20 km。震后1 a余滑释放的地震矩为8.8×1019 Nm，等价矩震级为MW7.3，占同震释放总能量的12%。扣除黏弹性松弛效应之后，反演的余滑分布更加集中于同震破裂下倾区域，断层模型底部无余滑，平均余滑深度减小为16 km。经黏弹性松弛效应改正后的余滑模型释放的地震矩为5.7 ×1019 Nm，仅为同震释放能量的8%左右。该余滑模型不但提高了数据的拟合精度，且其分布特征更接近应力驱动的模型。由于震后余滑发生在深部而非浅部未破裂区域，说明断层浅部仍处在闭锁状态，其未来的地震危险性仍需密切关注。