Seismic b-values and its correlation with seismic moment and Bouguer gravity anomaly over Indo-Burma ranges of northeast India: Tectonic implications

Bora, Dipok K.; Borah, Kajaljyoti; Mahanta, Rinku; Borgohain, Jayanta Madhab

doi:10.1016/j.tecto.2018.01.001

Cited by 35 publications

(30 citation statements)

References 46 publications

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“…They found that the lowest b-values are obtained for reverse faulting, highest for normal, followed by the strike-slip. In Indo-Burma ranges of northeast India, the b-constant has high value in normal faulting regions, the moderate value in strike-slip faulting regions, and low value in reverse faulting regions (Bora et al 2018). In a young orogenic belt in Taiwan, the b-value of normal faulting events is higher than of the strike-slip faulting events, which in turn is higher than the reverse faulting events (Wu et al, 2018).…”

Section: Reliance Of B-value On Focal Mechanismsmentioning

confidence: 95%

“…Globally, the reliance of b-constant value on focal depth in the continental seismicity regions was achieved by Al-Heety (2011). The reliance of b-constant value on the fault plane solutions was discussed locally and/or regionally, in California and Japan by Schorlemmer et al (2005), in Japan by Ishibe et al (2008), in Italy by Gulia and Wiemer (2010), and in India by Bora et al (2018). Based on the global scale, Al-Heety and Al Esho (2019) studied the relationship of b-constant value with faulting type.…”

Section: Introductionmentioning

confidence: 99%

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The Reliance of the Earthquake B-Value on Depth and Focal Mechanism

Al-Heety

Mohammad

2021

IGJ

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The earthquake size distribution (b-value) is a significant factor to recognize the seismic activity, seismotectonic, and seismic hazard assessment. In the current work, the connection of the b-constant value with the focal depth and mechanism was studied. The effect of the study scale (global, regional and local) on the dependence of b-value on the focal mechanisms was investigated. The database is quoted from the Global Centroid Moment Tensor catalog. The selected earthquakes are the shallow normal, reverse and strike-slip events. The completeness magnitude (Mc) is 5.3. The maximum likelihood method is utilized to compute the b-value. The obtained results show that the b-value is decreasing with depth to range 10-20 km, then increases to the depth of 40km. The turning point of b-value (increasing of b-value) locates at the depth of the transition brittle-ductile zone. Globally and regionally, low, moderate, and high b-values are associated with reverse, strike-slip, and normal focal mechanisms, respectively, while locally, the relation between b-values and focal mechanisms shows different association trends, such as low, moderate, and high b-values are associated with normal, strike-slip, and reverse focal mechanisms and so on.

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Section: Reliance Of B-value On Focal Mechanismsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

The Reliance of the Earthquake B-Value on Depth and Focal Mechanism

Al-Heety

Mohammad

2021

IGJ

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“…(Figure-4). The previous studies showed that normal faulting events typically show higher b-values, while strike-slip and reverse events have intermediate and low b-values, respectively [6], [7], [9], [15]). The low bvalues reflect high differential stress while high b -values indicate low differential stress.…”

Section: Focal Depth Distributionmentioning

confidence: 95%

“…Shimazaki [4] classified earthquakes into interplateearthquake (occurs at a tectonic plate boundary) and intraplate earthquake (occurs in a tectonic plate interior).Doglioni [5] classified the induced earthquakes based on their origin into more detailed subclasses, such as graviquake, reinjection quake, hydro fracturing quake, and loading quake. Many authors used terms, such as normal earthquake (graviquake), reverse earthquake, and strike-slip earthquake to indicate earthquakes that occur on normal, reverse, and strike-slip faults, respectively [6][7][8][9]. These earthquake subclasses are not cited in the classical literature of earthquakes seismology as a definite classification, as in the classifications mentioned above.…”

Section: Introductionmentioning

confidence: 99%

New Updated Classification of Shallow Earthquakes Based on Faulting Style

Al-Heety

2020

eijs

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Earthquakes occur on faults and create new faults. They also occur on normal, reverse and strike-slip faults. The aim of this work is to suggest a new unified classification of Shallow depth earthquakes based on the faulting styles, and to characterize each class. The characterization criteria include the maximum magnitude, focal depth, b-constant value, return period and relations between magnitude, focal depth and dip of fault plane. Global Centroid Moment Tensor (GCMT) catalog is the source of the used data. This catalog covers the period from Jan.1976 to Dec. 2017. We selected only the shallow (depth less than 70kms) pure, normal, strike-slip and reverse earthquakes (magnitude ≥ 5) and excluded the oblique earthquakes. The majority of normal and strike-slip earthquakes occurred in the upper crust, while the reverse earthquakes occurred throughout the thickness of the crust. The main trend for the derived b-values for the three classes was: b normal fault>bstrike-slip fault>breverse fault. The mean return period for the normal earthquake was longer than that of the strike-slip earthquakes, while the reverse earthquakes had the shortest period. The obtained results report the relationship between the magnitude and focal depth of the normal earthquakes. A negative significant correlation between the magnitude and dip class for the normal and reverse earthquakes is reported. Negative and positive correlation relations between the focal depth and dip class were recorded for normal and reverse earthquakes, respectively. The suggested classification of earthquakes provides significant information to understand seismicity, seismtectonics, and seismic hazard analysis.

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“…These events show how crucial it is to have studies on earthquakes originating from subduction zone activities such as observing earthquake activity based on the level of energy accumulation and release (Awadh, 2021). A method that can be used to examine earthquake activity is by analyzing b-value variations (Bora et al, 2018;Hatzidimitriou et al, 1985;Molchan and Dmitrieva, 1990). The variation of the b-value is a seismotectonic parameter of an area usually close to 1 and shows the relative number of small and large vibrations (Aki, 1965;Al-Ridah and Mohammed, 2017;Gutenberg and Richter, 1944).…”

Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Analysis of b-value Imaging Characteristics Using High Precision Earthquake Spot in the Sumatran Subduction Zone

Syukri

Darisma

Cahyan

et al. 2021

IGJ

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Sumatra is one of the Indonesian regions categorized as active tectonics. The majority of past earthquakes in Sumatra and its surrounding areas have originated from the accumulated stress in the subduction zone, namely the submergence of the Indo-Australian plate against the Eurasian plate. This research was conducted to identify the level of accumulated stress and earthquake-prone areas in the subduction zone of Sumatra Island based on the spatial variation of the b-value, using the least square method. The data used in this study are earthquake parameter data from the International Seismological Center the United States Geological Survey and Meteorological, Climatological, and Geophysical Agency catalogs from 2005-2019 with a magnitude ≥ 1 and a depth of 0-200 km located 90° to 106°E and -6° to 5.8°S. The results showed that the spatial variation of the b-value in the subduction zone of Sumatra Island in 2005-2009 ranged from 0.31-0.77, the b-value for 2010-2014 ranged from 0.18-1.29. In 2015-2019, the spatial variation of b-values ranged from 0.28-1.2. Earthquake-prone areas are located around Breuh Island, Banyak Islands, and Sipura and Pagai Islands, as evidenced by a low b-value, correlating with a high level of unreleased accumulated stress from the past 15 years, leading to an immense earthquake potential in the next period within the area. This analysis shows very significantly found that high b-value matches with earthquake spots. Detailed spatial and temporal b-value characteristics and its interpretation can advance our comprehension of earthquake occurrence and ideally lead to improved forecasting agility.

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Seismic b-values and its correlation with seismic moment and Bouguer gravity anomaly over Indo-Burma ranges of northeast India: Tectonic implications

Cited by 35 publications

References 46 publications

The Reliance of the Earthquake B-Value on Depth and Focal Mechanism

The Reliance of the Earthquake B-Value on Depth and Focal Mechanism

New Updated Classification of Shallow Earthquakes Based on Faulting Style

Spatial and Temporal Analysis of b-value Imaging Characteristics Using High Precision Earthquake Spot in the Sumatran Subduction Zone

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