Seismotectonics of the Armutlu peninsula (Marmara Sea, NW Turkey) from geological field observation and regional moment tensor inversion

Kinscher, Jannes; Krüger, Frank; Woith, Heiko; Lühr, Birger-Gottfried; Hintersberger, Esther; Irmak, Tahir Serkan; Barış, Şerif

doi:10.1016/j.tecto.2013.07.016

Cited by 26 publications

(17 citation statements)

References 73 publications

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“…4.4, Fig. 34,Örgülü, 2011,Öztürk et al, 2015, Kinscher et al, 2013. We can follow this line of argument for the Princes-Island-Segment by considering the two normal faulting events we here observe at its western tip (events 6 and 7 in Fig.…”

Section: Absolute Epicentral and Magnitude Distributionsupporting

confidence: 63%

A unified earthquake catalogue for the Sea of Marmara Region, Turkey, based on automatized phase picking and travel-time inversion: Seismotectonic implications

et al. 2018

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Section: Absolute Epicentral and Magnitude Distributionsupporting

confidence: 63%

A unified earthquake catalogue for the Sea of Marmara Region, Turkey, based on automatized phase picking and travel-time inversion: Seismotectonic implications

et al. 2018

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“…[52,62,63]). The focal mechanism studies in Armutlu Peninsula showed that most earthquakes are characterized by normal faulting [14,34,36,44]. Also, variations are also due to different crustal structures, thickness, rock types, physical properties and ultimately its degree of heterogeneity.…”

Section: Resultsmentioning

confidence: 99%

“…A complete understanding of the historical and instrumental seismicity, tectonics, geology, paleoseismology, and other neotectonic properties of the considered region are necessary for an ideal delineation of seismic source zones. Microseismicity and seismotectonics of the eastern part of the Marmara Sea, have been discussed by several researchers following the 1999 Izmitearthquake (e.g., [14,16,17,[31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]). Using all available research results, earthquake epicenters from 2000 to 2014, with a magnitude greater than Mw ≥ .…”

Section: Data Processingmentioning

confidence: 99%

“…Even though historic earthquake locations are controversial, in the period of AD 1500-1900, ve M > 7 earthquakes (1509, 1719, 1754, 1766, 1894) occurred around the Armutlu Peninsula [11]; [12]. The last largest event occurred in 1419 with an estimated magnitude of M 6.8 [11,13,14]. However, the largest event in the last century in the Marmara Sea was the Cinarcik Earthquake (Ms 6.4) occurred on September 18, 1963 [15].…”

Section: Introductionmentioning

confidence: 99%

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Spatial Analysis of b-value Variability in Armutlu Peninsula (NW Turkey)

Yeken

2016

Open Geosciences

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Spatial variations of b values were studied by means of 2376 earthquakes with a magnitude completeness of 2.7 in the Armutlu Peninsula (NW Turkey) during a 15-year period following the destructive earthquake on August 17, 1999 in Kocaeli. The b value of L6 for the entire Armutlu Peninsula represents a large value for a global value, but this analysis suggested that the distribution of b value around the Armutlu Peninsula varied extensively from 1.2 to 2.6. Several pockets of high bvalue re ected changes in the physical properties of the Armutlu Peninsula. The southern part of the peninsula represents a lower b value against the northern part of the peninsula. A high bvalue was observed around Termal and Armutlu towns where plenty of geothermal springs occur. Seismic tomography studies revealed a low velocity zone beneath the Termal area where the high b value was imaged in this study. A seismic swarm which is considered to be related with geothermal activity also occurred in 2014 at the same place. This observation suggests that it is possible to propose that the high b value in the northern part of the peninsula could be related to hydrothermal/geothermal activity which contributes to lowering the e ective stress.

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“…Such catalogs are very useful for global studies, such as investigations of plate movements, stress maps, and subduction zone geometries. However, tectonically active regions with a high hazard potential, and therefore high economic and mortality risk, need a more focused investigation of moment tensors to understand their seismotectonics in more detail (e.g., Kinscher et al, 2013). Such investigations also need to include moment tensors of moderate to small earthquakes (3:0 ≳ M w ≳ 4:0) observed on a regional scale to enlarge the database for seismotectonic investigations.…”

Section: Introductionmentioning

confidence: 99%

Combined Inversion of Broadband and Short-Period Waveform Data for Regional Moment Tensors: A Case Study in the Alborz Mountains, Iran

Donner

Rössler

Ghods

2014

Bulletin of the Seismological Society of America

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In this study, we suggest a novel approach for the retrieval of regional moment tensors for earthquakes with small to moderate magnitudes. The first modification is the combined inversion of broadband and short-period waveform data. The broadband waveforms are inverted in a frequency range suitable for surface waves, whereas for the short-period data a frequency range suitable for body waves is applied. The second modification is the use of first-motion body-wave polarities to select the most probable solution out of all solutions from inversion. To combine three different criteria for selecting the most probable solution (i.e., residual from inversion, doublecouple content of solution, number of nonmatching first-motion body-wave polarities), the L2 norm is applied to the normalized parameters. We chose five earthquakes within the Alborz mountains, Iran, as a case study (3:1 ≤ M w ≤ 4:1). In this area, several factors exacerbate the difficulty of performing inversion for moment tensors, for example, a heterogeneous station network and large azimuthal gaps. We have demonstrated that our approach supplies reliable moment tensors when inversion from broadband data alone fails. In one case, we successfully retrieved a stable solution from short-period waveform data alone. Thus, our approach enables successful determination of seismic moment tensors wherever a sparse network of broadband stations has thus far prevented it.

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Seismotectonics of the Armutlu peninsula (Marmara Sea, NW Turkey) from geological field observation and regional moment tensor inversion

Cited by 26 publications

References 73 publications

A unified earthquake catalogue for the Sea of Marmara Region, Turkey, based on automatized phase picking and travel-time inversion: Seismotectonic implications

A unified earthquake catalogue for the Sea of Marmara Region, Turkey, based on automatized phase picking and travel-time inversion: Seismotectonic implications

Spatial Analysis of b-value Variability in Armutlu Peninsula (NW Turkey)

Combined Inversion of Broadband and Short-Period Waveform Data for Regional Moment Tensors: A Case Study in the Alborz Mountains, Iran

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