Tectonic geomorphology and seismic hazard of the east boundary thrust in northern segment of the Sunda–Andaman subduction zone

Bhat, Gulam Rasool; Balaji, S.; Yousuf, Maqbool

doi:10.1007/s11069-022-05680-6

Cited by 2 publications

(2 citation statements)

References 53 publications

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“…Our analysis shows that the northern segments are comparatively quiet since the megathrust earthquake which can lead to a major earthquake in the near future. Bhatt et al (26) based on the mapping of coseismic ruptures of the Eastern boundary thrust of Andaman over the last 2000 years also suggest an increase in slip deficit which can lead to a https://www.indjst.org/ large magnitude earthquake in the Andaman-Nicobar region.…”

Section: Discussionmentioning

confidence: 99%

Seismotectonics of Andaman-Sumatra Region: Seismic Quiescence and B Value as Possible Precursors

Anjana¹,

Lasitha²

2023

IJST

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Objectives: a) To analyze the long-term seismicity and understand the potential of seismic quiescence study to use it as a reliable seismic precursor b) To estimate B value and understand the variation in B value as earthquake precursor in seismically active region. Methods: The present study analyses the seismicity pattern from the Andaman-Sumatra region for a period of 1964 to 2018. The area has been divided into epicentral blocks. Earthquakes preceding and succeeding a major earthquake with different seismic phases of quiescence and pattern of seismicity have been studied carefully. All quiescence periods are characterized by high b values and period of major shocks has a low b value. Main shock events for each epicentral block with different phases of quiescence (Q1, Q2 and Q3) and active seismicity have been identified and analyzed. Findings: The study suggests that there is generally approximately 6-12 years of gap between major earthquakes. There are 28 years of quiescence before the major earthquake of the stature of Dec 26, 2004 mega earthquake, suggesting that long term quiescence leads to great earthquakes. The study also proposes that the area between 2 0 and 6 0 N latitudes shows a long-term quiescence which may lead to a major earthquake in the near future. A thorough analysis of long-term seismicity and seismic quiescence can be used as an earthquake precursor, though with limitations. The latest post seismic quiescence period Q2 after the greater events of 2004 and 2005, may yield an impending event of 6.5 M or even greater. Novelty: The present study deals with the precursor studies of one of the most important tectonic zone. Extensive analysis of 54 Years of data has been done and the scope of using seismicity and b value for the long-term prediction of earthquakes has been examined. The periodicity of seismicity has been used to quantify the precursors. Though various statistical studies have been attempted for this zone, methodology adopted here proved one of the reliable methods to check for the possible mega earthquakes of this seismically active zone, which can be applied to other seismically active areas as well.

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Section: Discussionmentioning

confidence: 99%

Seismotectonics of Andaman-Sumatra Region: Seismic Quiescence and B Value as Possible Precursors

Anjana¹,

Lasitha²

2023

IJST

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“…This structure is pivotal in creating accretionary prisms within the outer-arc ridge of the Andaman and Nicobar subduction zones (Fig. 1; Bhat et al, 2023).…”

Section: Study Areamentioning

confidence: 99%

Shoreline and Land Use Land Cover Changes along the 2004 tsunami-affected South Andaman Coast: Understanding Changing Hazard Susceptibility

Ghadamode,

Aruna,

Pandey

et al. 2024

Preprint

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Abstract. The 2004-tsunami affected the South Andaman coast experiencing dynamic changes in the coastal geomorphology making the region vulnerable. We focus on pre-and post-tsunami shoreline and Land Use Land Cover changes for the period 2004, 2005, and 2022 to analyse the dynamic change in hazard. We used GEBCO bathymetry data to calculate Run-up (m), arrival times (Min), and inundation (m) at 13 different locations using the 2004 Sumatra Earthquake source parameters. The Digital Shoreline Analysis System is used for the shoreline change estimates. The Landsat data is used to calculate shoreline and LULC change in five classes, namely Built-Up Areas, Forests, Inundation areas, Croplands, and water bodies during the above period. We examine the correlation between the LULC changes and the dynamic change in shoreline due to population flux, infrastructural growth, and Gross State Domestic Product growth. India industry estimates the Andaman & Nicobar Islands losses exceed INR 10 billion during 2004 that would see a five-fold increase in economic loss due to a doubling of built-up area, a three-fold increase in tourist inflow, and a population density growth. The unsustainable decline in the forest cover, mangroves and cropland would affect sustainability during a disaster despite coastal safety measures.

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Tectonic geomorphology and seismic hazard of the east boundary thrust in northern segment of the Sunda–Andaman subduction zone

Cited by 2 publications

References 53 publications

Seismotectonics of Andaman-Sumatra Region: Seismic Quiescence and B Value as Possible Precursors

Seismotectonics of Andaman-Sumatra Region: Seismic Quiescence and B Value as Possible Precursors

Shoreline and Land Use Land Cover Changes along the 2004 tsunami-affected South Andaman Coast: Understanding Changing Hazard Susceptibility

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