Estimation of Strong Ground Motion from a Great Earthquake Mw 8.5 in Central Seismic Gap Region, Himalaya (India) Using Empirical Green’s Function Technique

Sharma, Babita; Chopra, Sumer; Sutar, Anup K.; Bansal, B. K.

doi:10.1007/s00024-013-0647-0

Cited by 23 publications

(2 citation statements)

References 24 publications

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“…Moreover, the simulated PGA values are compared with earlier studies for the same region using the correlation coefficient (r) as shown in figure 6. (Chopra et al 2012;Sharma et al 2013;Sharma and Bungum 2006). Isoacceleration maps for all the three possible locations of mainshock have been developed using simulated records at every corner of the grid (figures 7-9).…”

Section: Resultsmentioning

confidence: 99%

Modelling of strong motion generation areas for a great earthquake in central seismic gap region of Himalayas using the modified semi-empirical approach

et al. 2019

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Over the past decades, strong motion generation areas (SMGAs) have received significant attention in the modelling of high-frequency records. Herein, we propose the source model for a scenario earthquake (M w 8.5) in the central seismic gap region of Himalayas. On the rupture plane, three SMGAs have been identified. Further, SMGA parameters are evaluated using available empirical relations. The spatiotemporal distribution of aftershocks is utilised to locate these SMGAs on the rupture plane. Further, the modified semi-empirical technique (MSET) is used to simulate the strong motion records. It has been observed that the study area can expect peak ground acceleration of >100 cm/s 2 and its distribution is mainly affected by the location of nucleation point in the rupture plane. Furthermore, the estimated peak ground acceleration (PGA) values are comparable with the earlier studies in the region. This confirms the robustness of generated rupture model with three SMGAs and the reliability of MSET to simulate high-frequency records.

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Section: Resultsmentioning

confidence: 99%

Modelling of strong motion generation areas for a great earthquake in central seismic gap region of Himalayas using the modified semi-empirical approach

et al. 2019

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“…The hybrid Green's function technique comprising both the 2.5-D nite difference and stochastic simulation techniques are adopted for simulating strong ground motions of great earthquake from the 1994 Northridge earthquake (Mw 6.7) (Kamae and Pitarka 1996). Using the empirical Green's function technique, Sharma et al (2013) considered the recorded 1991 Uttarkashi earthquake as Green function (element earthquake) to estimate the strong ground motion of great earthquake (Mw 8.5) at critical 13 sites in Kumaun-Garhwal. Recently, Sharma and Mishra (2020) estimated the ground motion for the target earthquake (Mw 7.0) from the recorded 2009 Bhutan mainshock (Mw 6.1) and its largest aftershock (Mw 5.1) using empirical Green's function approach, and further demonstrated the importance of rupture initiation points for the variable Peak Ground Acceleration (PGA) beneath the Bhutan Himalayan region.…”

Section: Introductionmentioning

confidence: 99%

Simulation of a plausible great earthquake (Mw 8.0) sourced on down-going Indian slab beneath Indo-Burmese wedge and its implications for North East (NE) Indian region

Chingtham¹,

Sharma

Mohan

2022

Preprint

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The 4th January 2016 Manipur earthquake (Mw 6.7) occurred along the Indo-Burmese wedge and ruptured towards NW direction causing severe damage to buildings/structures in North-East (NE) Indian region. A plausible earthquake (Mw 8.0) is simulated to estimate the ground motions and associated seismic hazard by means of the waveforms of 2016 Manipur earthquake (Mw 6.7) as an element earthquake considering the source in the subduction boundary of the Indo-Burmese wedge at an intermediate depth. The empirical greens function mechanism (EGFM) is adopted to accomplish the better utilization of the observed ground motions of the recorded earthquake as an element earthquake and to achieve the probable ground motions in order to acquire the appropriate path/site effects in the simulated ground motions. The obtained results demonstrate the impact of the comparable rupture directivity pattern in both element as well as the simulated earthquakes. The Peak Ground Acceleration (PGA) in NE India from element and simulated earthquakes vary from 3 cm/sec2 and 11 cm/sec2 to 103 cm/sec2 and 342 cm/sec2 at epicentral distances of 624 km and 53 km respectively. The high amplitude surface waves due to the interference of seismic waves along with the combined effects of rupture directivity and site amplification showcased the highest PGA value at Shillong (SHL). This site is located on Pre-Cambrian rock and situated at an epicentral distance of 214 km from the source zone, which is lying at an intermediate depth that might have propelled the direct seismic waves of higher intensity at a longer distance compared to other sites. The outcome of the present study highlights the significance of varied ground motion parameters among the observed sites to the extent of bearing the damage potential of strong ground motions. The related analysis also advocates for the simulated PGA variations and associated duration of the earthquake waveforms exposed on different geological formations that have strong bearings on the seismic risk involved with future probable great earthquake in the study region. Moreover, simulated ground motions of expected plausible disastrous earthquakes on numerous geological formations beneath the various sites have significant impacts on designing critical structures/buildings such as schools, hospitals, bridges, dams and nuclear power plants for NE India. Thus, the detailed investigations on ground motion parameters, simulation of ground motion and the influence of different geological/geomorphological conditions on duration, shape and maximum amplitude of ground motion may be supportive for implementing earthquake risk and mitigation plans in order to assess the seismic hazard of the study region.

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Earthquake Response and Its Implications Towards the Structural Design Codes for Himalayan Range and Adjoining Regions of India

Sharma,

Sandhu

2023

Advances in Natural and Technological Hazards Research

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Estimation of Strong Ground Motion from a Great Earthquake Mw 8.5 in Central Seismic Gap Region, Himalaya (India) Using Empirical Green’s Function Technique

Cited by 23 publications

References 24 publications

Modelling of strong motion generation areas for a great earthquake in central seismic gap region of Himalayas using the modified semi-empirical approach

Modelling of strong motion generation areas for a great earthquake in central seismic gap region of Himalayas using the modified semi-empirical approach

Simulation of a plausible great earthquake (Mw 8.0) sourced on down-going Indian slab beneath Indo-Burmese wedge and its implications for North East (NE) Indian region

Earthquake Response and Its Implications Towards the Structural Design Codes for Himalayan Range and Adjoining Regions of India

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