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Sea level Changes Affect Seismicity Rates in a Hydrothermal System Near Istanbul

Description: 

Small stress changes such as those from sea level fluctuations can be large enough to trigger earthquakes. If small and large earthquakes initiate similarly, high-resolution catalogs with low detection thresholds are best suited to illuminate such processes. Below the Sea of Marmara section of the North Anatolian Fault, a segment of 150 km is late in its seismic cycle. We generated high-resolution seismicity catalogs for a hydrothermal region in the eastern Sea of Marmara employing AI-based and template matching techniques to investigate the link between sea level fluctuations and seismicity over six months. Local seismicity rates are larger during time periods shortly after local minima on sea level, when it is already rising. Local strainmeters indicate that seismicity is promoted when the ratio of differential to areal strain is the largest. The strain changes from sea level variations, on the order of 30-300 nstrain, are sufficient to promote seismicity.

Session: New Observations and Modeling of Triggered Seismicity

Type: Oral

Date: 4/19/2023

Presentation Time: 05:00 PM (local time)

Presenting Author: Patricia Martínez-Garzón

Student Presenter: No

Invited Presentation: 

Authors