Earthquake relocation in the Central Alborz region of Iran using a non-linear probabilistic method

Maleki, Vahid; Shomali, Zaher‐Hossein; Hatami, Mohammad; Pakzad, Mehrdad; Lomax, Anthony

doi:10.1007/s10950-012-9342-3

Cited by 14 publications

(4 citation statements)

References 21 publications

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“…We further constrained the locations by also utilizing the equal differential time likelihood function (Font et al., 2004) that is calculated as the difference of residuals at station pairs. Uncertainties for each absolute location are the variances provided by NonLinLoc (Maleki et al., 2013). Figure S7 in Supporting Information S1 shows the distribution of the horizontal and vertical uncertainties where their mean values are 0.85 km (±0.33 km) and 1.24 km (±0.55 km), respectively.…”

Section: Methodsmentioning

confidence: 99%

A Deeper Look Into the 2021 Tyrnavos Earthquake Sequence (TES) Reveals Coseismic Breaching of an Unrecognized Large‐Scale Fault Relay Zone in Continental Greece

et al. 2022

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shows that such events rupture the ground surface through complex slip patterns that often reveal coseismic slip transfer between numerous synthetic and/or antithetic faults that intersect at depth (Figure 1a). There are also documented cases in which the mainshock triggered, in addition to coseismic, also syn-seismic (or sympathetic) slip on neighboring faults that do not appear to be connected to the seismogenic zone (Nurminen et al., 2020), with an outstanding example being the 1987 Edgecumbe Earthquake in New Zealand (Beanland et al., 1989;Delano et al., 2022) (Figure 1b). The spatial complexity of normal fault earthquakes is notably matched by their temporally variable occurrence (Figure 1c). Indeed, large-magnitude normal fault earthquakes often form clusters that span hours (i.e.,

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Section: Methodsmentioning

confidence: 99%

A Deeper Look Into the 2021 Tyrnavos Earthquake Sequence (TES) Reveals Coseismic Breaching of an Unrecognized Large‐Scale Fault Relay Zone in Continental Greece

et al. 2022

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“…We further constrained the locations by also utilizing the equal differential time likelihood function (Font et al, 2004) that is calculated as the difference of residuals at station pairs. Uncertainties for each absolute location are the variances provided by NonLinLoc (Maleki et al, 2013). Figure S7 in Supporting Information S1 shows the distribution of the horizontal and vertical uncertainties where their mean values are 0.85 km (±0.33 km) and 1.24 km (±0.55 km), respectively.…”

Section: Seismological Datamentioning

confidence: 99%

A Deeper Look Into the 2021 Tyrnavos Earthquake Sequence(TES) Reveals Coseismic Breaching of an UnrecognizedLarge-Scale Fault Relay Zone in Continental Greece

Mouslopoulou

Sudhaus²,

konstantinou³

et al. 2023

Preprint

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<p>Large magnitude (Mw &#8764; &#8805;6) earthquakes in extensional settings are often associated with simultaneous rupture of multiple normal faults as a result of static and/or dynamic stress transfer. Here, we report details of the coseismic breaching of a previously unrecognized large-scale fault relay zone in central Greece, through three successive normal fault earthquakes of moderate magnitude (Mw 5.7&#8211;6.3) that occurred over a period of &#8764;10 days in March 2021. Specifically, joint analysis of InSAR, GNSS and seismological data, coupled with detailed field and digital fault mapping, reveals that the Tyrnavos Earthquake Sequence (TES) was accommodated at the northern end of a &#8764;100 km wide transfer structure, by faults largely unbroken during the Holocene. By contrast, the southern section of this relay zone appears to have accrued significant slip during Holocene. InSAR-derived displacements agree with the loci of eight subtle, previously undetected, faults that accommodated coseismic and/or syn-seismic normal fault slip during the TES. Kinematic modeling coupled with fault mapping suggests that all involved faults are interconnected at depth, with their conjugate fault-intersections acting largely as barriers to coseismic rupture propagation. We also find that the TES mainshocks were characterized by unusually high (>6 MPa) stress-drop values that scale inversely with rupture length and earthquake magnitude. These findings, collectively suggest that the TES propagated north-westward to rupture increasingly stronger asperities at fault intersections, transferring slip between the tips of a well-established, but previously unrecognized, relay structure. Fault relay zones may be prone to high stress-drop earthquakes and associated elevated seismic hazard.</p>

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“…Recording continuous raw data was started on 2010 December 23, three days after the mainshock, until 2011 January 06. Rezapour and Mohsenpur (2013) by investigating this continuous data located 314 aftershocks recorded by a minimum of 4 stations with an azimuthal gap less than 180 deg , and with a root-mean-square (rms) of arrival time residual less than 0.2 s. Some previous studies on this fault considered two individual and perpendicular faults around this mainshock (e.g., [26,27]). However, some of the other previous studies suggested a fault with rake angle in order of 80 deg ( [28]),while most of aftershock events (more than 90%) were occurred in a narrow band zone (∼ 2 km) along the defined escarpment of fault by [29], so that the aftershocks' epicentral cover an area with 20 × 2 km (the white box in map of Fig.…”

Section: Rigan Earthquakementioning

confidence: 99%

Avalanches on the Complex Network of Rigan Earthquake, Virtual Seismometer Technique, Criticality and Seismic Cycle

Najafi,

Rahimi-Majd,

Shirzad

2019

Preprint

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We base our study on the statistical analysis of the Rigan earthquake 2010 December 20, which consists of estimating the earthquake network by means of virtual seismometer technique, and also considering the avalanche-type dynamics on top of this complex network.The virtual seismometer complex network shows power-law degree distribution with the exponent γ = 2.3 ± 0.2. Our findings show that the seismic activity is strongly intermittent, and have a cyclic shape as is seen in the natural situations, which is main finding of this study. The branching ratio inside and between avalanches reveal that the system is at (or more precisely close to) the critical point with power-law behavior for the distribution function of the size and the mass and the duration of the avalanches, and with some scaling relations between these quantities. The critical exponent of the size of avalanches is τS = 1.45 ± 0.02. We find a considerable correlation between the dynamical Green function and the nodes centralities.

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Earthquake relocation in the Central Alborz region of Iran using a non-linear probabilistic method

Cited by 14 publications

References 21 publications

A Deeper Look Into the 2021 Tyrnavos Earthquake Sequence (TES) Reveals Coseismic Breaching of an Unrecognized Large‐Scale Fault Relay Zone in Continental Greece

A Deeper Look Into the 2021 Tyrnavos Earthquake Sequence (TES) Reveals Coseismic Breaching of an Unrecognized Large‐Scale Fault Relay Zone in Continental Greece

A Deeper Look Into the 2021 Tyrnavos Earthquake Sequence(TES) Reveals Coseismic Breaching of an UnrecognizedLarge-Scale Fault Relay Zone in Continental Greece

Avalanches on the Complex Network of Rigan Earthquake, Virtual Seismometer Technique, Criticality and Seismic Cycle

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