Source Mechanism and Rupture Process of the 24 January 2020 Mw 6.7 Doğanyol–Sivrice Earthquake obtained from Seismological Waveform Analysis and Space Geodetic Observations on the East Anatolian Fault Zone (Turkey)

Taymaz, Tuncay; Ganas, Athanassios; Yolsal‐Çevikbilen, Seda; Vera, Felipe; Eken, Tuna; Erman, Ceyhun; Keleş, Derya; Kapetanidis, Vasilis; Valkaniotis, Sotirios; Karasante, Ilektra; Tsironi, Varvara; Gaebler, Peter; Melgar, Diego; Öcalan, Taylan

doi:10.1016/j.tecto.2021.228745

Cited by 66 publications

(51 citation statements)

References 99 publications

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“…Our approach bridges the gap between conventional finite fault inversions, discrete sub-event parameterisations, and seismic back-projection, the latter requiring very few assumptions about the fault geometry and rupture information (Ishii et al, 2005;Y. Xu et al, 2009;Meng et al, 2012;Nissen et al, 2016;Satriano et al, 2012;Yao et al, 2011;Taymaz et al, 2021). Still, our approach additionally provides kinematic information by directly solving for the potency-rate density distribution.…”

Section: Methodsmentioning

confidence: 98%

“…The Eastern Mediterranean region is one of Earth's most active tectonic environments, where the Anatolian plate is extruded westward, escaping from the collision between the Arabian and Eurasian plates (McKenzie, 1972;Taymaz, Jackson, & McKenzie, 1991;Taymaz, Eyidogan, & Jackson, 1991;Taymaz et al, 2004). To the southeast of the Anatolian plate, the left-lateral East Anatolian Fault (EAF), along with the right-lateral North Anatolian Fault (NAF), accommodates the extrusion of the Anatolian plate (Jackson & McKenzie, 1984;Taymaz, Eyidogan, & Jackson, 1991;Taymaz et al, 2021). The EAF forms an intra-continental transform fault, which separates the Anatolian and Arabian plates (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Although the EAF has been less seismically active than that around the NAF since instrumental-based catalogues started (e.g., Ambraseys, 1989), the EAF has hosted magnitude M 7+ earthquakes in the past, for example, an M 7.1 1893 in Çelikhan, M 7.4 1513 in Pazarcık, and an M 7.5 in 1822 to the east of Hassa (Ambraseys, 1989;Ambraseys & Jackson, 1998;Duman & Emre, 2013). Most recently, in 2020, a moment magnitude M W 6.8 Doğanyol-Sivrice earthquake broke the region east of the 1893 M 7.1 earthquake (Melgar et al, 2020;Pousse-Beltran et al, 2020;Ragon et al, 2021;Taymaz et al, 2021), located to the north-east of the 2023 earthquakes focused in this study. The EAF is recognized to have multiple geometrically segmented faults and a series of bends, step-overs, and sub-parallel faults, leading to complex fault networks (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Multi-scale rupture growth with alternating directions in a complex fault network during the 2023 south-eastern Türkiye and Syria earthquake doublet

Okuwaki¹,

Yagi²,

Taymaz³

et al. 2023

Preprint

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A devastating doublet of earthquakes with moment magnitude Mw 7.9 and Mw 7.6 earthquakes contiguously occurred in south-eastern Türkiye near the north-western border of Syria. Here we perform a potency-density tensor inversion to simultaneously estimate rupture evolution and fault geometry for the doublet. We find the initial Mw 7.9 earthquake involves a supershear back-rupture propagation, which is triggered by the initial bifurcated-fault rupture along a splay of the East Anatolian Fault and triggers the rupture in the southwest. The second Mw 7.6 event is triggered by the adjacent Mw 7.9 event, and it also involves supershear rupture along the favorably curved fault, which however is immediately stopped by geometric barriers in the fault ends. Our results highlight the multi-scale cascading rupture growth across the complex fault network that affects the diverse rupture geometries of the 2023 Türkiye earthquake doublet, contributing to the strong ground shaking and associated devastation.

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Section: Methodsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multi-scale rupture growth with alternating directions in a complex fault network during the 2023 south-eastern Türkiye and Syria earthquake doublet

Okuwaki¹,

Yagi²,

Taymaz³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Nowadays, InSAR technology is mature and provides reliable, spatially dense information on coseismic & postseismic displacements after shallow earthquakes [49,50,53,55,[79][80][81][82][83][84][85][86][87][88]. What is evident with InSAR, when the quality is very high, as is the case over Arkalochori, is that the InSAR-based displacement of proximal campaign GPS stations (such as AS15; Figure 1) is nearly as accurate as GNSS measurements in the field.…”

Section: The Relative Value Of Insar Vs Gnss Observationsmentioning

confidence: 99%

The Arkalochori Mw = 5.9 Earthquake of 27 September 2021 Inside the Heraklion Basin: A Shallow, Blind Rupture Event Highlighting the Orthogonal Extension of Central Crete

et al. 2022

Self Cite

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A strong, shallow earthquake occurred near Heraklion (Crete, Greece) on 27 September 2021. The earthquake produced significant ground deformation in the vicinity of Arkalochori village but without any evidence for surface ruptures of primary origin. We used geodetic (InSAR and GNSS) data to map motions of the Earth’s surface that occurred during and shortly after the earthquake. A 14 cm subsidence of the GNSS station ARKL and a maximum of 19 cm distance from the SAR satellite were recorded. The measured surface displacements were used to constrain the rupture geometry and slip distribution at depth. Our best-fitting inversion model suggests that the rupture occurred on a 13 km-long planar normal fault striking N195° E dipping 55° to the northwest, with major slip occurring to the east and updip of the hypocentre. The fault tip is located 1.2 km beneath the surface. The maximum coseismic slip occurred in the uppermost crust, in the depth interval of 4–6 km. A decrease in the fault offsets toward the Earth’s surface is likely caused by an increased frictional resistance of the shallow layers to rapid coseismic slip. Satellite observations made in the first month after the earthquake detected no post-seismic deformation (i.e., below one fringe or 2.8 cm). The seismic fault may be identified with the Avli (Lagouta) segment of the NNE-SSW striking, west-dipping, 23 km-long neotectonic Kastelli Fault Zone (KFZ). Part of the rupture occurred along the Kastelli segment, indicating a fault segment linkage and a history of overlapping ruptures along KFZ. Based on geological data and footwall topography we estimate an average slip rate between 0.17–0.26 mm/yr for the KFZ. The Arkalochori earthquake is a paradigm example for the on-going extension of Heraklion basin (central Crete) in the WNW-ESE direction, which is almost orthogonal to the E-W Messara graben and other active faults along the south coast of Crete.

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“…We generally need to be cautious with the segmentation estimates for smaller earthquakes (M W <6.5) when there is limited, or no available surface rupture measured in the field. Among the 34 studied events, the Haiti earthquake (event ID 20), Sivrice earthquake (event ID 24), Stanley earthquake (event ID 27) and Jiuzhaigou earthquake (event ID 28) do not have clear surface deformation or recognized slip (Hayes et al, 2010;Pollitz et al, 2020;Sun et al, 2018;Taymaz et al, 2021), so their segmentation estimates are from geophysical inversions and are correspondingly uncertain.…”

Section: Correlations Between Each Maturity Measure and Seismological...mentioning

confidence: 99%

Seismological Indicators of Geologically Inferred Fault Maturity

Guo

Lay

Brodsky

2022

Preprint

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Variations in fault maturity have intermittently been invoked to explain variations in some seismological observations for large earthquakes. However, the lack of a unified geological definition of fault maturity makes quantitative assessment of its importance difficult. We evaluate the degree of empirical correlation between field measurements indicative of fault zone maturity and remotely measured seismological source parameters of 34 large shallow strike-slip events. Metrics based on fault segmentation, such as number of primary rupture segments and surface rupture azimuth, correlate best with seismic source attributes and the correlations with cumulative fault slip are somewhat weaker. Average rupture velocity shows the strongest correlation with metrics of maturity, followed by relative aftershock productivity. Mature faults have relatively lower aftershock productivity and higher rupture velocity. A more complex relation is found with moment-scaled radiated energy. There appears to be distinct behavior of very immature events with no prior mapped fault and < 1 km cumulative slip, which radiate modest seismic energy, while moderately mature faults have events with higher moment-scaled radiated energy and very mature faults with increasing cumulative slip tend to have events with reducing moment-scaled radiated energy. We also explore qualitative and composite assessments of maturity and arrive at similar trends. This empirical approach establishes that there are relationships between remote seismological observations and fault system maturity that can help to understand variations in seismic hazard among different fault environments and to assess the relative maturity of blind fault systems for which direct observations of maturity are very limited.

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Source Mechanism and Rupture Process of the 24 January 2020 Mw 6.7 Doğanyol–Sivrice Earthquake obtained from Seismological Waveform Analysis and Space Geodetic Observations on the East Anatolian Fault Zone (Turkey)

Cited by 66 publications

References 99 publications

Multi-scale rupture growth with alternating directions in a complex fault network during the 2023 south-eastern Türkiye and Syria earthquake doublet

Multi-scale rupture growth with alternating directions in a complex fault network during the 2023 south-eastern Türkiye and Syria earthquake doublet

The Arkalochori Mw = 5.9 Earthquake of 27 September 2021 Inside the Heraklion Basin: A Shallow, Blind Rupture Event Highlighting the Orthogonal Extension of Central Crete

Seismological Indicators of Geologically Inferred Fault Maturity

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