Rosendo Romero-Andrade, Manuel E. Trejo-Soto, Karan Nayak, Daniel Hernández-Andrade, Naccieli Bojorquez-Pacheco
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引用次数: 1
Abstract
An earthquake called the MW7.2 “El Mayor Cucapah” earthquake on April 4, 2010 has been analyzed for seismic precursor. The changes in the lineament system concerning its pattern and time intervals were analyzed during the earthquake preparation period and occurrence using the automated lineament detection method. The Landsat 5 TM images were processed using LESSA and ADALGEO software obtaining similar results. The statistical analysis revealed the stress accumulation due to plate interaction during earthquake formation. The study shows that the number of extracted lineaments changes rapidly about 23 months before the earthquake, and the systems return to the initial stage after 23 months. Most lineaments coincide with the extension of the San Andreas Fault as NW direction is the dominant trend. Thus, it can be concluded that the featural changes within the Rose diagram corresponding to the different strokes direction along with oriented elongation lines as disclosed in the present study using satellite images could be identified as a mid-term and/or short-term precursors of the earthquake. However, even though the dynamism of the El Mayor Cucapah earthquake is found in the extracted lineaments, it is possible to isolate more significant earthquakes even if new ones appear near the zone. Moreover, using two algorithms for lineament detection allows for the tectonics to corroborate the obtained lineaments and dynamism.
作为地震前兆的轮廓分析:2010年4月4日墨西哥下加利福尼亚的El Mayor Cucapah地震(MW7.2)
2010年4月4日发生的MW7.2“El Mayor Cucapah”地震被分析为地震前兆。利用线线自动检测方法,分析了地震准备期和地震发生期间线线系统在模式和时间间隔上的变化。使用LESSA和ADALGEO软件对Landsat 5 TM图像进行处理,得到相似的结果。统计分析揭示了地震形成过程中由于板块相互作用引起的应力积累。研究表明,在地震发生前23个月左右,提取的轮廓线数量变化迅速,23个月后系统恢复到初始阶段。大部分剖面与圣安德烈亚斯断层的伸展相吻合,北西向为主导走向。因此,可以得出结论,本研究利用卫星图像揭示的Rose图中与不同笔划方向相对应的特征变化以及定向延伸线可以被确定为地震的中期和/或短期前兆。然而,即使在提取的轮廓中发现了El Mayor Cucapah地震的动态,即使在该区域附近出现了新的地震,也有可能隔离出更严重的地震。此外,使用两种算法进行线条检测允许构造证实所获得的线条和动力学。
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.