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Comparing Fault Zones that Host Induced and Tectonic Earthquakes in Oklahoma and California

Description: 

We have developed a new approach to detect and image fault zone structures through the azimuthal variation of earthquake spectra. The spatial distribution of earthquake clusters where the high-frequency amplification is observed could shed light on the characteristics of the fault damage zone. Our previous studies show that the Ridgecrest fault zone structure is more coherent along strike compared to that of the Parkfield region. Our results also demonstrate the fault zone structure can extend up to ~10 km given the observation of high-frequency energy from earthquake clusters. Our method has only been applied in tectonic regions thus far, but understanding the fault zone structure in induced seismicity regions is also important as it can provide pathways for fluid propagation. Hence, we plan to investigate induced earthquakes in Oklahoma and more tectonic earthquakes in Southern California. For example, possible candidates include the Fairview, Oklahoma region comprising near-vertical narrow strike-slip faults and the San Jacinto fault zone, which comprises three fault strands with different structure. We will use the stacked P-wave velocity spectra of M<3 earthquake clusters from broadband stations to identify any azimuthal variation in high-frequency energy. We aim to apply our method to search for fault damage zone structures in those regions in order to enhance our understanding of the co-evolution of fault zones and earthquake cycles.

Session: Characteristics and Mechanics of Fault Zone Rupture Processes, from Micro to Macro Scales [Poster Session]

Type: Poster

Date: 5/2/2024

Presentation Time: 08:00 AM (local time)

Presenting Author: Jing Ci

Student Presenter: Yes

Invited Presentation: 

Authors