Seismic parameters re-determined from historical seismograms of 1935-Erdek–Marmara Island and 1963-Çınarcık Earthquakes

Abstract

In this study, the original seismograms of the 1935-Erdek-Marmara Island and 1963-Çınarcık Earthquakes, recorded at local and regional distances, were vectorized. The epicentral locations have been calculated using available readings from original records and also ISS and seismic station bulletins for 04.01.1935-14:41 and 16:20 Marmara Island-Erdek Earthquakes and 18.09.1963-16:58 Çınarcık Earthquake. The epicenter determinations show that the first event in 04.01.1935 was located at 40.72N-27.72E, while the second one occurred at 40.61N-27.43E, indicating that both were located near the Marmara Island. Another finding is that the 1963 event was located at 40.80N-29.18E, near the Princes' Island fault. Furthermore, moment tensor inversion method was applied on these earthquakes by using original seismograms, which provided an opportunity to illuminate the seismotectonic features of Marmara Region based on the retrieved fault mechanism solutions. For the first time, the fault mechanisms for 04.01.1935-14:41 and 16:20 Earthquakes were determined using moment tensor inversion from the original seismic waveforms. Likewise, the result obtained for the fault mechanism of 1963 Çınarcık Earthquake showed normal fault mechanism with much shallower depth than estimated before. Our preferred solutions showed that the fault mechanisms for the three events are normal faults and coincide with the seismotectonic structure of the Marmara Region.

A Novel Approach for Assessing the Performance of Offshore Ground Improvement in Floating Storage and Regasification Unit (FSRU) Terminal Construction

“…GF lies between the western part of the Marmara Sea and the North Aegean Trench. GF is defined as a dextral strike-slip fault on the land while it has an oblique component in the sea [38][39][40][41]. The most detrimental earthquake generated by the GF during the instrumental period was the Şarköy-Mürefte Earthquake (9 August 1912).…”

Re‐examination of the 1928 Parral, Mexico earthquake (M6.3) using a new multiplatform graphical vectorization and correction software for legacy seismic data

“…In different published works on historical earthquake re-analyses, authors have used manual or semiautomatic vectorization schemes to obtain digital time series from analogue seismograms (e.g. Baştürk et al, 2016;Ichinose et al, 2003;Pino et al, 2004, among others). Different GUI-based software to obtain digital seismograms from raster images have been developed, for example, SeisDig by Bromirski et al, (2003) and DigitSeis by Bogiatzis and Ishii (2016), both developed under the MatLab platform.…”