We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
2023年12月18日甘肃积石山6. 2级地震 震源机制及其对周围区域的应力影响.
- Authors
王润妍; 万永革; 宋泽尧; 关兆萱
- Abstract
In order to study the stress implication of the 2023 Ms6. 2 earthquake in Jishishan, Gansu on the surrounding areas, the central focal mechanism solution of the earth-quake is estimated based on the focal mechanism data provided by various institutes and scholars, with nodal plane I: strike 159. 08°, dip 40. 57°, and rake 112. 46°, and nodal plane H: strike 310. 52°, dip 53. 05°, and rake 71. 88°. It can be judged as a reverse focal mechanism type of this earthquake. Projecting the local tectonic stress tensor on the two nodal planes of the central focal mechanism, the resulted relative shear stress on the nodal plane are 0. 797 and 0. 951, respectively, which mean that the earthquake is a normal energy release under the action of the local tectonic stress field. The NNW striking of the Lajishan Northern Margin fault is dipping SWW and dip angle of 45°〜55° by geological field investiga/tion, and nearly consistent with the nodal plane I of the central focal mechanism, we consider that the Lajishan Northern Margin fault is the seismogenic fault of the earthquake. Based on the rupture model and homogeneous elastic half-space model, we calcula te the co-seismic displacement field and strain field genera ted by the eart hquake in the surrounding areas. The volume trie st rain a_t the epicenter area shows t ensile t ension, and the northeast and southwest sides far from the epicenter show slight tensile tension, and the periphery of the epicenter shows compression with strong compression on the east side. The horizontal displacemen t presen ts the out flow of material from the nort hwes t and a small portion of the southeast side of the epicenter, while the ma_terial from the northeast and southwest sides of the epicenter is inflowed into the epicenter. Corresponding to the horizontal displacement field, the vertical displacement field is uplifted at the epicenter, while the surrounding area shows little subsidence.
- Publication
Earthquake (1000-3274), 2024, Vol 44, Issue 1, p175
- ISSN
1000-3274
- Publication type
Article
- DOI
10.12196/j.issn.1000-3274.2024.01.014