23.04.2025 22:20
Istanbul University Cerrahpaşa Faculty of Engineering has published a preliminary assessment report regarding the earthquake with a magnitude of 6.2. The report states, "The earthquake has a right-lateral strike-slip faulting mechanism. The area affected by this earthquake sequence does not encompass all the fault segments defined as seismic gaps within the Sea of Marmara, where a rupture is anticipated."
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The preliminary report prepared by Istanbul University Cerrahpaşa Faculty of Engineering regarding the earthquake with a magnitude of 6.2 states, "The earthquake has a right-lateral strike-slip fault mechanism. The area affected by this earthquake sequence does not encompass all the fault segments defined as seismic gaps within the Sea of Marmara, where a rupture is expected."
FIRST REPORT ON THE EARTHQUAKE PUBLISHED
A preliminary report regarding the earthquake with a magnitude of 6.2 that occurred off the coast of Silivri in the Sea of Marmara was prepared by the Departments of Geology and Geophysics of Istanbul University Cerrahpaşa Faculty of Engineering.
The report included the following statements: "At 12:49:09 Turkey time, a strong earthquake with a moment magnitude (MW) of 6.2 occurred in the Sea of Marmara off the coast of Silivri. The earthquake was felt strongly by all districts on both the Anatolian and European sides of Istanbul. The focal depth of the earthquake was measured at 13 km, making it a shallow-focus earthquake. However, the earthquake was also felt intensely in some provinces of the Marmara Region and even the Aegean Region."
The distance from the epicenter of the earthquake to the center of Silivri is 25 km. Aftershocks are continuing, with the largest being an aftershock at 15:12:57 MW=5.2. The total number of aftershocks recorded as of 16:59:57 is 85. Aftershocks are ongoing. Figure 1 shows the location map of earthquakes with local magnitudes greater than 3 in the Sea of Marmara and its vicinity over the last 3 years.
"DOES NOT COVER ALL THE FAULT SEGMENTS EXPECTED TO RUPTURE"
The focal mechanism solution of the earthquake using the moment tensor method is shown in Figure 2. The earthquake, which occurred in the Kumburgaz Basin located between the Middle and Çınarcık basins on the branch of the North Anatolian Fault in the Sea of Marmara, has a right-lateral strike-slip fault mechanism. The area affected by this earthquake sequence does not encompass all the fault segments defined as seismic gaps within the Sea of Marmara, where a rupture is expected. While it is not possible to provide precise information regarding the timing of the earthquakes, taking necessary precautions will be beneficial in reducing potential earthquake damages."
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