Earthquake Science

Shear wave splitting analysis of local earthquakes from dense arrays in Shimian, Sichuan 🔍 New Study on Seismic Anisotropy in the Shimian Area, Sichuan, China 🌍 Researchers have investigated seismic anisotropy in the upper crust of the Shimian area, a tectonically active region where several faults intersect. Using local seismic data from dense arrays, they analyzed shear wave splitting to explore crustal stress and tectonic settings. 🧐 📌 Key Points: • We used local seismic data from dense arrays to obtain the seismic anisotropy characteristics in the upper crust of the Shimian area, where several faults intersect. • Polarization directions of the fast shear wave are highly consistent throughout the Shimian area; the dominant orientation of NW-SE aligns with the regional principal compressive stress. • The delay time between fast and slow shear waves exhibits minor variations at different stations and is slightly greater than in other areas of Sichuan, indicating relatively high anisotropy in the fault intersection zone. • This study reveals important information on stress conditions and tectonic deformation patterns at the junction of the Bayan Har, Sichuan-Yunnan, and Yangtze blocks. This work deepens our understanding of seismogenic stress and tectonic deformation in complex fault zones. 🔗 Check out the full paper for more insights：https://lnkd.in/g8y_X7AH Click here to submit a paper: https://lnkd.in/e4DydcAM #Seismology #EarthquakeScience #Tectonics #SeismicAnisotropy #ShearWave #EarthquakeResearch #Geology #Sichuan

Discover the latest EQS release of Volume 38, Issue 2, including 7 articles: - A correlation study of selected geomagnetic events recorded by the Egyptian observatories and INTERMAGNET stations https://lnkd.in/eqEWY5XT - High-quality control of receiver functions using a capsule neural network https://lnkd.in/eQ-cSKBK - 3D crustal density modeling of Egypt using GOCE satellite gravity data and seismic integration https://lnkd.in/eX98CtpG - Predicting peak ground acceleration using the ConvMixer network https://lnkd.in/e3N8j_N7 - Multi-parameter modeling and analysis of ground motion amplification in the Quaternary sedimentary basin of the Beijing-Tianjin-Hebei region https://lnkd.in/e_WYYKnE - The quest for good research ideas https://lnkd.in/ebX8GZmn - A few nifty tips for conducting scientific research https://lnkd.in/e5fcJtdy Click here for the issue: https://lnkd.in/e_ef8Hs4 Click here to submit a journal: https://lnkd.in/e4DydcAM We hope this information will be helpful for your research. #EQS #Earthquake #Science #Geology #SeismicStudy

📚 The Study on Ground Motion Simulation of 2022 Luding Earthquake in China 🌍 A groundbreaking study by Zhang et al. (2023) dives into the strong ground motion of the 2022 MS6.8 Luding Earthquake in Sichuan, China. Using stochastic finite-fault simulations (SFFM), the researchers compared simulated data with real-world observations from 28 strong-motion stations. The results? Significant differences, particularly between near-field and far-field stations. 🔍 Key Points: Stochastic finite-fault simulations of the 2022 MS6.8 Luding earthquake matched observations. Nonlinear site effects were observed at stations with rupture distances < 40 km. Lateral heterogeneity in the quality factor affected simulation results at frequencies > 1 Hz. The study concludes that simulating ground motion in regions with complex geological structures requires careful attention to site effects and variations in crustal properties. By improving the Q-value in simulation models, we can enhance the accuracy of ground-motion predictions. 🌐 🔗 Check out the full paper for more insights：https://lnkd.in/gkhJSN2E Click here to submit a paper: https://lnkd.in/e4DydcAM #EarthquakeResearch #SeismicScience #GroundMotionSimulation #Geophysics #ChinaEarthquake #EarthquakeScience

Paper Analysis —— DiTing: A Benchmark Dataset for AI-Driven Seismology in China

📊 Introducing DiTing: A Groundbreaking Seismic Dataset for AI in Seismology! 🌍 In our Vol 36 Issue 2, 《Earthquake Science》 presents a study: "DiTing: A Chinese Seismic Benchmark Dataset for AI Seismology," researchers unveil a new, large-scale Chinese seismic benchmark dataset tailored for artificial intelligence applications in seismology. Compiled from reports by the China Earthquake Networks Center (2013-2020), DiTing includes millions of three-component waveform traces, along with P- and S-phase arrival time labels, specifically designed to improve AI models used for earthquake detection, seismic phase identification, and broader seismological research. 📌 [Key points] The first large-scale Chinese seismic benchmark dataset for artificial intelligence in seismology is proposed. The dataset is of great significance for training high generalization models for seismic data processing applicable to Chinese mainland. The dataset serves a high-quality benchmark for various kinds of machine learning model development and data-driven seismological research. This dataset is set to be a valuable resource for advancing intelligent seismic data processing in China and beyond. Don't miss out on the full details of this innovative benchmark in Earthquake Science. 🔗 Read the full article in Earthquake Science: https://lnkd.in/gvu-q3fB Click here to submit a paper: https://lnkd.in/e4DydcAM #Seismology #AIinSeismology #DiTing #EarthquakeScience #SeismicData #AI #SeismicResearch #EarthquakeDetection

🌍 Revisiting the Moment Magnitudes of the February 6, 2023, Turkey Earthquakes 🌍 In our Vol 36 Issue 2, 《Earthquake Science》 presents a groundbreaking study: "Moment magnitudes of two large Turkish earthquakes on February 6, 2023 from long-period coda" by Jiang et al. (2023). This research provides a refined magnitude analysis of the devastating earthquake doublet that struck south-central Turkey, using a long-period coda moment magnitude method—a novel approach designed for large-magnitude seismic events (MW > 7.5). 📌 Key points A long-period coda moment magnitude method was used to measure the moment magnitudes of the two large mainshocks that occurred in south-central Turkey on February 6, 2023. The moment magnitudes (with one standard error) of the first and second mainshocks are 7.95±0.013 and 7.86±0.012, respectively, which are larger than all the previous reports. The first mainshock, among the largest in the Turkish history, was slightly larger than the second one by 0.11±0.035 in magnitude. 📖 This research enhances our understanding of seismic hazard assessment and earthquake magnitude determination, contributing to global efforts in earthquake monitoring and risk evaluation. 🔗 Read the full article in Earthquake Science: https://lnkd.in/g-rwN5Hs Click here to submit a paper: https://lnkd.in/e4DydcAM #Seismology #EarthquakeResearch #EarthquakeScience #Science #TurkeyEarthquakes

We’ve published the study in <Earthquake Science>: “Constraining the Crustal Structure under the Central and Western Tian Shan Using Teleseismic Receiver Functions and Gravity Anomalies”. 🏔️✨ This research paper investigates the crustal structure of the Tian Shan mountain range in Central Asia using a novel method combining teleseismic receiver functions and gravity anomalies. The study reveals significant lateral variations in crustal thickness and P-to-S wave velocity ratios (vP/vS), particularly in the central Tian Shan. These variations suggest crustal shortening, mafic underplating, and potentially crustal melting. The findings also indicate that the Talas-Fergana Fault may be a trans-lithospheric fault. The paper compares these results with previous studies and discusses their implications for understanding the region's tectonic evolution. 📌 Key points Lateral variations of the crustal thickness and average crustal v(P)/v(S)in the central and western Tian Shan were studies for the first time by H-κ stacking of joint P receiver functions and gravity data. The large differences of crustal structure between the western and central Tian Shan indicating that Talas-Fergana Fault (TFF) may be a trans-lithospheric fault. Variations of mean v(P)/v(S) provide important constraints on the crustal composition and thermal state of the Tian Shan orogenic belt. 🌍 These findings enhance our understanding of the region’s tectonic evolution and contribute to seismic hazard assessment. 📖 Read the full paper here: https://lnkd.in/gqkmxv6D Click here to submit a paper: https://lnkd.in/e4DydcAM #Seismology #EarthquakeResearch #EarthquakeScience #Science

🚨 New Research Published in Earthquake Science on the 2015 Nepal Gorkha Earthquake Aftershocks! 🌍 We’re excited to share our latest study, now published in Earthquake Science, where we apply cutting-edge machine learning techniques to analyze the aftershock sequence of the 2015 Nepal Gorkha earthquake. By leveraging the LOC-FLOW workflow, which includes advanced algorithms like PhaseNet, REAL, HYPOINVERSE, and HypoDD, we constructed a high-precision aftershock catalog and uncovered key insights into the region's seismic behavior. Key findings: MHT Structure and Aftershock Distribution: The gentle-slope geometry of the Main Himalayan Thrust (MHT) plays a key role in shaping the aftershock distribution. Tear Fault Segmentation: A significant right-lateral strike-slip tear fault near 85.4°E causes a sharp division in the aftershock distribution along the fault strike. Dual Structure Effects: In the easternmost area of the study region, dual structural features seem to influence aftershock activity. This work not only advances our understanding of seismic hazards in the region but also demonstrates the power of machine learning in earthquake research, offering improved methods for aftershock analysis and future seismic risk assessments. Read the full paper in Earthquake Science to explore how these findings can contribute to better earthquake prediction and risk evaluation. 🔗 https://lnkd.in/eB_vUvaJ Click here to submit a paper: https://lnkd.in/e4DydcAM We hope this information will be helpful for your research. #EarthquakeResearch #MachineLearning #NepalEarthquake #SeismicHazard #MHT #Geophysics #AftershockAnalysis #EarthquakePrediction #SeismicRisk #ResearchInnovation

🌏 New Insights into the South China Sea's Geological Evolution! 🧭 Published in Earthquake Science, the latest study explores the post-rifting magmatism at the northern margin of the South China Sea (SCS), shedding light on the region’s complex geological history. Using data from an ocean bottom seismometer (OBS) experiment, we identified a high-velocity lower crust (HVLC) anomaly in the continent-ocean transition (COT) zone and uncovered its likely formation through post-rift magmatism linked to the Hainan Plume. Keypoints of the Article: Crustal Structure: The narrow COT zone (only ~40 km wide) features an HVLC layer with P-wave velocities of 7.0–7.6 km/s and a thickness of 3-4 km. Magmatism Mechanism: Traditional syn-rift models cannot fully explain the HVLC. Instead, our results suggest post-rifting magmatism after 25 Ma, peaking around 22–24 Ma. Rifting Dynamics: The northern SCS margin likely started as a magma-poor rift during its initial breakup, with the HVLC forming later through magmatism associated with mantle upwelling. OBS Experiment: Using a 360-km seismic profile (OBS2020-1) and advanced modeling techniques, we mapped deep crustal structures with unprecedented clarity. Why It Matters: This research challenges conventional ideas about magma-rich passive margins in the region, providing new perspectives on the tectonic evolution of the South China Sea. It also underscores the critical role of post-rift magmatism in shaping crustal structures, offering valuable insights for geophysical and geochemical studies worldwide. Read the full paper in Earthquake Science to explore these groundbreaking findings in detail. 🔗 https://lnkd.in/eyd9SEcU Click here to submit a paper: https://lnkd.in/e4DydcAM We hope this information will be helpful for your research. #EarthquakeScience #SouthChinaSea #Geology #RiftingProcesses #HainanPlume #CrustalStructure #SeismicResearch #OBSExperiment #PostRiftingMagmatism

The China Earthquake Networks Center (CENC) has determined that a magnitude 6.8 earthquake occurred in Dingri County, Shigatse City, Xizang (28.50°N, 87.45°E) on January 7, 2025, at 9:05 AM, with a focal depth of 10 kilometers. To better understand the regional tectonics and seismic activity, Earthquake Science has compiled relevant academic papers on seismic activities in the area: 🔹 Building the 3D seismic fault models for the 2021 MS6.4 Yunnan Yangbi earthquake: The potential role of pre-existing faults in generating unexpected moderate-strong earthquakes in southeast Xizang: https://lnkd.in/ee_Z6Mbk 🔹 Lithospheric structure and deformation in SE Tibet revealed by ambient noise and earthquake surface wave tomography: Recent advances and perspectives: https://lnkd.in/ep8FeFHE 🔹 Distribution of the low velocity bulk in the middle-to-lower crust of southern Tibet: implications for formation of the north–south trending rift(2) zones: https://lnkd.in/eZ6kbfku 🔹 Scale lengths of heterogeneities under Tibet: https://lnkd.in/euBPd9Mw 🔹 Assessment of shear wave velocity models in the Southeast Tibet with full-wave simulation: https://lnkd.in/eFrw6jFK 🔹 Crustal thickness in southeast Tibet based on the SWChinaCVM-1.0 model: https://lnkd.in/ecnQf326 🔹 Investigation of Coulomb stress changes in south Tibet (central Himalayas) due to the 25th April 2015 MW 7.8 Nepal earthquake using a Coulomb stress transfer model: https://lnkd.in/eUBwjcrH 🔹 Rupture imaging of the 25 April 2015 MW7.9 Nepal earthquake from back-projection of teleseismic P waves: https://lnkd.in/e_CZspaG 🔹 Machine learning-based aftershock seismicity of the 2015 Gorkha earthquake controlled by flat-ramp geometry and a tear fault: https://lnkd.in/eB_vUvaJ 🔹 Gorkha earthquake (MW7.8) and aftershock sequence: A fractal approach: https://lnkd.in/gJKrDWw2 #EQS #Earthquake #Science #Xizang