Illuminating the Jericho Fault from A New Local Seismic Network
Description:
The Jericho Fault is an active fault segment located north of the Dead Sea Lake. It is considered the source of significantly large earthquakes in the region, such as the 6.25 𝑀𝐿 magnitude earthquake in 1927[AS1] and is classified as a locked fault. Although a significant amount of work has been reported on the Jericho Fault, several key questions remain unanswered. Firstly, can we provide direct seismological evidence of the fault from earthquakes? What is the fault width in seismogenic depths? Is the fault completely seismically quiet towards low magnitudes (i.e., below 1)? Answering these questions will improve seismic hazard estimates and provide information on micro-seismicity along locked faults.
From one year of data (06/22 – 06/23) we find 63 seismic events in the range of -0.54 < 0.84, that are below the detection threshold of the permanent regional network. We support the observation of a locked fault towards the microseismic range as most events lie off-fault. Additionally, microseismicity there does not follow a Gutenberg-Richter power-law distribution. Therefore, it questions the validity of using power-law distributions to estimate the maximum magnitude. The Jericho Fault releases significantly less seismic moment than the Anza gap (a seismically quiescent segment of the San Jacinto Fault), indicating a particularly quiet fault. The whole fault appears to be creeping from ~0-20 Km aseismically with tiny release of seismic energy, supporting observations from geodetic studies. More strain energy could be accumulating, and release as relatively large earthquakes compared to fault segments that release seismic moment more frequently. Secondly, we analyse trapped waves, which reveals information about the damaged section of the Jericho Fault zone. We observe trapped waves across our local array and to our knowledge this is the first direct seismological evidence from earthquakes of a coherent zone of damaged rock that trends northwards from the Dead Sea Lake.
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: Adam
Student Presenter: No
Invited Presentation:
Authors
Adam Klinger Presenting Author adam_klinger@hotmail.com Geological Survey of Israel |
Ittai Kurzon Corresponding Author ittaik@gsi.gov.il Geological Survey of Israel |
Amir Sagy asagy@gsi.gov.il Geological Survey of Israel |
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Illuminating the Jericho Fault from A New Local Seismic Network
Category
Characteristics and Mechanics of Fault Zone Rupture Processes, from Micro to Macro Scales