Multi-criteria approach using GIS for macro-level seismic hazard assessment of Kachchh Rift Basin, Gujarat, western India – First step towards ... View Full Text


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Article Info

DATE

2021-12-21

AUTHORS

Vasu Pancholi, Nisarg Bhatt, Pawan Singh, Sumer Chopra

ABSTRACT

The earthquakes have the most dominating societal and economic impact on the built environment. The earthquakes in an intraplate region are infrequent but often damaging. The uncontrolled urban growth in cities due to population explosion and migration makes it necessary to assess seismic hazards in an active region. It provides parameters for seismic safety and helps in disaster mitigation. The Kachchh Rift Basin (KRB) of western India is a seismically active intraplate region where many damaging earthquakes have occurred in the past (Mw 7.8 in 1819, Mw 7.6 in 2001). The KRB hosts many economic corridors and ports. Though the region has been put in a category with highest seismic hazard, the entire region is not prone to high hazards. The primary objective of the study is to integrate major attributes that influence seismic hazard on a GIS platform and prepare a multi-criteria-based hazard map by multi-criteria decision process named as analytical hierarchy process (AHP) developed by Saaty. In this study, the information about some of the attributes like peak ground acceleration (PGA), geology and geomorphology, and tsunami hazard is taken from published literature, whereas shear wave velocity to 30 m depth (Vs)30 and amplification factor were obtained through empirical relationships. The integration of these different attributes was performed, and weights were assigned depending on their contribution to the seismic hazard. The multi-criteria approach reveals that the southwestern part comprising of Kachchh mainland has a low hazard as compared to central and northern parts and almost 1 million people and around 0.18 million houses are exposed to moderate to high hazard. Large swaths of land are prone to liquefaction hazard. The corridor comprising of Bhuj, Bhachau and Rapar needs seismic microzonation. This macro level hazard map will be beneficial for the urban planners and government authorities to decide the areas, where seismic microzonation or site-specific studies are required that would help in mitigating earthquake disasters in the future. More... »

PAGES

3

References to SciGraph publications

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  • 2001-10. The deadliest stable continental region earthquake occurred near Bhuj on 26 January 2001 in JOURNAL OF SEISMOLOGY
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  • 2008-11. Earthquake hazard in Northeast India — A seismic microzonation approach with typical case studies from Sikkim Himalaya and Guwahati city in JOURNAL OF EARTH SYSTEM SCIENCE
  • 2012-02-05. Triggered/migrated seismicity due to the 2001 Mw7.7 Bhuj earthquake, Western India in NATURAL HAZARDS
  • 2012-10-25. Deterministic seismic hazard macrozonation of India in JOURNAL OF EARTH SYSTEM SCIENCE
  • 2004-02. Seismic Hazard Mapping and Microzonation in the Sikkim Himalaya through GIS Integration of Site Effects and Strong Ground Motion Attributes in NATURAL HAZARDS
  • 2018-09-05. Rapid seismic hazard assessment of the Sabarmati River basin in Gujarat State, Western India using GIS techniques in BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
  • 2011-12-08. Deterministic seismic scenario for Gujarat region, India in NATURAL HAZARDS
  • 2007-04-21. A deterministic approach for preparation of seismic hazard maps in North East India in NATURAL HAZARDS
  • 2011-11-25. Seismic hazard and site-specific ground motion for typical ports of Gujarat in NATURAL HAZARDS
  • 2010-04-09. Effects of Impedance Contrast and Soil Thickness on Basin-Transduced Rayleigh Waves and Associated Differential Ground Motion in PURE AND APPLIED GEOPHYSICS
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    31 schema:description The earthquakes have the most dominating societal and economic impact on the built environment. The earthquakes in an intraplate region are infrequent but often damaging. The uncontrolled urban growth in cities due to population explosion and migration makes it necessary to assess seismic hazards in an active region. It provides parameters for seismic safety and helps in disaster mitigation. The Kachchh Rift Basin (KRB) of western India is a seismically active intraplate region where many damaging earthquakes have occurred in the past (Mw 7.8 in 1819, Mw 7.6 in 2001). The KRB hosts many economic corridors and ports. Though the region has been put in a category with highest seismic hazard, the entire region is not prone to high hazards. The primary objective of the study is to integrate major attributes that influence seismic hazard on a GIS platform and prepare a multi-criteria-based hazard map by multi-criteria decision process named as analytical hierarchy process (AHP) developed by Saaty. In this study, the information about some of the attributes like peak ground acceleration (PGA), geology and geomorphology, and tsunami hazard is taken from published literature, whereas shear wave velocity to 30 m depth (Vs)30 and amplification factor were obtained through empirical relationships. The integration of these different attributes was performed, and weights were assigned depending on their contribution to the seismic hazard. The multi-criteria approach reveals that the southwestern part comprising of Kachchh mainland has a low hazard as compared to central and northern parts and almost 1 million people and around 0.18 million houses are exposed to moderate to high hazard. Large swaths of land are prone to liquefaction hazard. The corridor comprising of Bhuj, Bhachau and Rapar needs seismic microzonation. This macro level hazard map will be beneficial for the urban planners and government authorities to decide the areas, where seismic microzonation or site-specific studies are required that would help in mitigating earthquake disasters in the future.
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    38 schema:keywords Bhachau
    39 Bhuj
    40 Economic Corridor
    41 GIS
    42 GIS platform
    43 Gujarat
    44 India
    45 Kachchh Mainland
    46 Kachchh rift basin
    47 Rapar
    48 Saaty
    49 acceleration
    50 active intraplate regions
    51 active region
    52 amplification factor
    53 analytical hierarchy process
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    55 area
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    58 authorities
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    60 categories
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    62 comprising
    63 contribution
    64 corridor
    65 criteria
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    67 damaging earthquakes
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    69 depth
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    74 earthquake disaster mitigation
    75 earthquakes
    76 economic impact
    77 empirical relationship
    78 entire region
    79 environment
    80 explosion
    81 factors
    82 future
    83 geology
    84 geomorphology
    85 government authorities
    86 ground acceleration
    87 growth
    88 hazard assessment
    89 hazard maps
    90 hazards
    91 hierarchy process
    92 high seismic hazard
    93 higher hazard
    94 house
    95 impact
    96 information
    97 integration
    98 intraplate regions
    99 land
    100 large swaths
    101 literature
    102 lower hazard
    103 mainland
    104 major attributes
    105 maps
    106 microzonation
    107 migration
    108 mitigation
    109 multi-criteria approach
    110 multi-criteria decision process
    111 northern part
    112 objective
    113 parameters
    114 part
    115 past
    116 peak ground acceleration
    117 people
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    121 ports
    122 primary objective
    123 process
    124 region
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    126 rift basins
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    133 site-specific studies
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    135 step
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    139 uncontrolled urban growth
    140 urban growth
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    142 velocity
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    146 schema:name Multi-criteria approach using GIS for macro-level seismic hazard assessment of Kachchh Rift Basin, Gujarat, western India – First step towards earthquake disaster mitigation
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