Study of fault plane using the interferometry of aftershocks: case study in the Rigan area of SE Iran

Shirzad, Taghi

doi:10.1093/gji/ggz015

Cited by 11 publications

(11 citation statements)

References 38 publications

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“…The Ref. [24] then developed and used this method to obtain group and and phase semidispersion measurement models of this fault plane. In addition, the rotation matrix was applied for projecting semi-Rayleigh wave inter-event EGFs on fault plane in that study.…”

Section: Rigan Earthquakementioning

confidence: 99%

“…However, the Kahurak fault is the strike-slip type, a rotation matrix is applied for retrieving Rayleigh wave inter-event EGF signals. Compared to the previous interferometry studies (e.g., [32,33]), some strict criteria were also applied by Shirzad [24] in the data selection and/or preparation step which can be summarized as epicentral distance from fault escarpment less than 2.5 km, the magnitude of aftershocks M > 2.0, horizontal and depth location uncertainties less than 2.5 km, and the projection angle, Ω, greater than 70. Afterward, the cross-correlation of prepared waveforms has been done, and then phase weighing stacking procedure (see [34]) has been performed to retrieve inter-event Rayleigh wave EGFs.…”

Section: A the Virtual Seismometer Techniquementioning

confidence: 99%

“…This technique was formulated by Curtis et al, [22,23] and suggested an alternative method to extract the inter-event EGF using the cross-correlating of event-pair synthetic waveforms recorded on a station [23]. This method has further been developed by Shirzad [24] on real data to study of hidden part of Kahurak fault plane. The dynamical model that we use is much like the bak-Tang-Weisendeld (BTW) sandpile model, which have already proved to be an acceptable choice for earthquakes [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Rigan Earthquakementioning

confidence: 99%

Section: A the Virtual Seismometer Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Seismicity following a main earthquake carries useful information regarding the triggering mechanism of earthquakes [23][24][25][26][27][28]. In recent years, many studies have focused on the historical earthquake sequence, including the Landers earthquake [29,30], the Chi-Chi earthquake [31], the mid-Niigata Prefecture earthquake [32], the Tohoku earthquake [33], and the Rigan earthquake [34]. ese studies promoted the understanding of the focal mechanisms of large earthquakes and offered engineering geologists a reference for making seismic hazard maps.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Evolution of Earthquakes in Longmenshan Fault and Adjacent Area, before and after the 2008 Wenchuan Earthquake

Fan

Wang

et al. 2021

Shock and Vibration

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Seismicity sequence following a main earthquake usually contains much meaningful information for unveiling the focal mechanism and predicting the reoccurrence interval of large earthquakes. The spatiotemporal evolution of earthquakes before and after the 2008 Wenchuan earthquake (Ms 8.0) is analysed comprehensively in this study. The frequency-magnitude relation of the 3493 earthquake events retrieved from the database of the International Seismological Centre indicates that the adopted catalogue is complete for magnitudes ≥Ms 3.4. The seismicity during the 10 years before the Wenchuan earthquake remained stable, including the magnitudes and focal depths. However, seismicity attenuated sharply in the year following the Wenchuan earthquake, and the magnitude of earthquakes before the Wenchuan earthquake decreased gradually. The area of the seismogenic zone of the 2008 Wenchuan earthquake was smaller than the earthquake stricken area. The earthquakes that occurred in the Longmenshan fault area and adjacent area in the study period were mainly shallow earthquakes. The focal depths of earthquakes in the study area became stable gradually after the Wenchuan earthquake, mainly within the range from 10 to 16 km. The earthquakes in the study area were mainly distributed with an along-dip distance of 0–20 km, and the seismicity was distributed uniformly along the fault strike.

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“…Based on source-receiver reciprocity theorem, one of the earthquakes is taken as a source, and the other one is considered a (virtual) receiver recording the waveform of the source. This earthquake interferometry approach provides inter-event EGF that is useful to study the Earth’s crustal structure where it is impossible to directly record waveforms, such as in fault zone tomography (see 6 and 7 ).…”

Section: Introductionmentioning

confidence: 99%

Crustal Structure of the Collision-Subduction Zone in South of Iran Using Virtual Seismometers

Shirzad

Riahi

Assumpção

2019

Sci Rep

Self Cite

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Improving the resolution of seismic tomography by adding virtual seismometers is an ambitious aim in regions with poor instrumental coverage. In this study, inter-event empirical Green’s functions (EGFs) were retrieved using cross-correlation of the vertical component of 630 earthquakes with M ≥ 4 which occurred around the collision-subduction transition zone in south Iran. To extract reliable inter-event EGFs and obtain stable tomographic results, we used about 1300 event pairs with good signal-to-noise ratio, each pair well aligned to a seismic station. Our results show that the retrieved inter-event EGFs agree well with those obtained from earthquakes in similar paths. The inverted velocity model presents two main layers including upper crust (up to ~16 km) and middle crust (deeper than ~18 km) in both sides of the Minab-Zendan-Palami transition zone. The upper crust contains two main layers: sedimentary and basement layers with thicknesses ~6 and ~10 km, respectively. Moreover, the main faults cause lateral variations in these main layers. The difference between the average velocities of the middle crust, between the collision and subduction zones, is about 0.5 km/s, delimited by faults. Also, an area with a 30 km width along these faults can be defined as the collision-subduction transition zone.

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Study of fault plane using the interferometry of aftershocks: case study in the Rigan area of SE Iran

Cited by 11 publications

References 38 publications

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

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

Spatiotemporal Evolution of Earthquakes in Longmenshan Fault and Adjacent Area, before and after the 2008 Wenchuan Earthquake

Crustal Structure of the Collision-Subduction Zone in South of Iran Using Virtual Seismometers

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