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Three-dimensional fine crustal P-wave velocity structure in the Yangbi and Eryuan earthquake regions, Yunnan, China
云南阳璧和洱源震区三维精细地壳纵波速度结构
中国雲南省漾ビイ・エルユアン地震地域における三次元微細地殻P波速度構造
중국 Yunnan, Yangbi 및 Eryuan 지진 지역의 3차원 미세 지각 P파 속도 구조
Estructura tridimensional de la velocidad de la onda P de la corteza fina en las regiones sísmicas de Yangbi y Eryuan, Yunnan, China
Structure tridimensionnelle de vitesse d'onde P crustale fine dans les régions sismiques de Yangbi et d'Eryuan, Yunnan, Chine
Трехмерная тонкая коровая структура скоростей P-волн в районах землетрясений Янби и Эрюань, Юньнань, Китай
Jia Jia 贾佳 ¹, Qingju Wu 吴庆举 ², Fuyun Wang 王夫运 ¹
¹ Geophysical Exploration Center, China Earthquake Administration, Zhengzhou 450002, China
中国 郑州 中国地震局地球物理勘探中心
² Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
中国 北京 中国地震局地球物理研究所
Earthquake Science, 1 September 2021
Abstract

A magnitude 5.5 earthquakes occurred in Eryuan County, Dali Bai Autonomous Prefecture, Yunnan Province, China, on March 3. And a magnitude 5.0 earthquake occurred in the same place on April 17, 2013, i.e., 45 days later. Then, on May 21, 2021, multiple earthquakes-one with magnitude 6.4 and several at 5.0 or above, occurred in Yangbi County, Dali Bai Autonomous Prefecture, Yunnan Province, China.

All of these occurred in the Weixi-Qiaohou-Weishan fault zone. In this study, 1,874 seismic events in Yangbi and Eryuan counties were identified by automatic micro-seismic tools and the first arrivals were picked up manually. Following this, a total of 11,968 direct P-wave absolute arrivals and 73,987 high-quality P-wave relative arrivals were collected for joint inversion via the double difference tomography method. This was done to obtain the regional three-dimensional crustal fine P-wave velocity structure. The results show that the travel time residuals before and after inversion decreased from the initial –0.1–0.1 s to –0.06–0.06 s. The upper crust in the study area, which exhibited a low-velocity anomaly, corresponded to the basin region; this indicated that the low-velocity anomaly in the shallow part of the study area was affected by the basin.

Results also showed some correlation between the distribution of the earthquakes and velocity structure, as there was a low-velocity body Lv1 with a wide distribution at depths ranging from 15–20 km in the Yangbi and Eryuan earthquake regions. In addition, earthquakes occurred predominantly in the high-low velocity abnormal transition zone. The low-velocity body in the middle and lower crust may be prone to concentrating upper crustal stress, thus leading to the occurrence of earthquakes.
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