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WITHDRAWN Sequence Analysis of the M7.1 South Halmahera Earthquake on July 14, 2019: Hypocenter Relocation, Moment Tensor and Static Stress Changes

Description: 

WITHDRAWN The M7.1 South Halmahera earthquake, which occurred on July 14, 2019, was a strike-slip event preceded by a foreshock three days earlier and followed by a series of aftershocks. This study investigates the triggering dynamics of this earthquake using precise hypocenter relocation with the Double-Difference method, moment tensor analysis to explore deformation patterns, and Coulomb stress modeling to evaluate static stress changes. The results indicate that the mainshock triggered aftershocks primarily to the west-northwest and southeast of the epicenter, consistent with static stress redistribution patterns. In the southwest of the mainshock, particularly in the eastern part of Bacan Island, normal-faulting earthquakes were identified in proximity to a hydrothermal zone. While tectonic processes remain the dominant factor in triggering seismicity, the presence of the hydrothermal system suggests a potential secondary influence in promoting localized earthquake activity in this area. This study provides valuable insights into the interplay between tectonic processes and localized factors, such as hydrothermal activity, in earthquake triggering. The findings contribute to a better understanding of seismic hazards in South Halmahera, particularly in regions influenced by complex geological settings.

Session: Late-breaking on Recent and Future Large Earthquakes [Poster]

Type: Poster

Date: 4/15/2025

Presentation Time: 08:00 AM (local time)

Presenting Author: Yusuf

Student Presenter: Yes

Invited Presentation: 

Poster Number: 141

Authors