Multi-Parametric Approach for Earthquake Precursor Detection in Assam Valley (Eastern Himalaya, India) using Satellite and Ground Observation Data

Chetia, Timangshu; Sharma, Gopal; Dey, Chandan; Raju, P. L. N.

doi:10.1134/s0016852120010045

Cited by 19 publications

(10 citation statements)

References 32 publications

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“…Notwithstanding the awareness of the importance of using a multidisciplinary approach and doing multi-parametric analyses [7][8][9][10], only recently some attempts have been made to build up actual multi-parametric models (e.g., [11]) not limited just to seismological observations [12].…”

Section: Introductionmentioning

confidence: 99%

RST Analysis of Anomalous TIR Sequences in Relation with Earthquakes Occurred in Turkey in the Period 2004–2015

et al. 2022

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The paper provides, for the first time, a long-term (>10 years) analysis of anomalous transients in Earth’s emitted radiation over Turkey and neighbouring regions. The RST (Robust Satellite Techniques) approach is used to identify Significant Sequences of Thermal Anomalies (SSTAs) over about 12 years (May 2004 to October 2015) of night-time MSG-SEVIRI satellite images. The correlation analysis is performed with earthquakes with M ≥ 4, which occurred in the investigated period/region within a pre-defined space-time volume around SSTA occurrences. It confirms, also for Turkey, the possibility to qualify SSTAs among the candidate parameters of a multi-parametric system for time-Dependent Assessment of Seismic Hazard (t-DASH). After analysing about 4000 images (about 400 million of single satellite records), just 155 SSTAs (about 4 every 100 images) were isolated; 115 (74% out of the total) resulted in earthquake-related (false-positive rate 26%). Results of the error diagram confirms a non-casual correlation between RST-based SSTAs and earthquake occurrences, with probability gain values up to 2.2 in comparison with the random guess. The analysis, separately performed on Turkish areas characterized by different faults and earthquakes densities, demonstrates the SSTA correlation with a dynamic seismicity more than with static tectonic settings.

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Section: Introductionmentioning

confidence: 99%

RST Analysis of Anomalous TIR Sequences in Relation with Earthquakes Occurred in Turkey in the Period 2004–2015

et al. 2022

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“…They have also observed the disturbances in the electron density profile from the same track. In Chetia et al [39], they have reported anomalies in three parameters to study the ionospheric perturbation related to the Kokrajhar, Assam EQ on 12 September 2018. The examined parameters were TEC, geomagnetic total field intensity, and soil radon.…”

Section: Introductionmentioning

confidence: 99%

Pre-Seismic Irregularities during the 2020 Samos (Greece) Earthquake (M = 6.9) as Investigated from Multi-Parameter Approach by Ground and Space-Based Techniques

et al. 2021

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We present a comprehensive analysis of pre-seismic anomalies as computed from the ground and space-based techniques during the recent Samos earthquake in Greece on 30 October 2020, with a magnitude M = 6.9. We proceed with a multi-parametric approach where pre-seismic irregularities are investigated in the stratosphere, ionosphere, and magnetosphere. We use the convenient methods of acoustics and electromagnetic channels of the Lithosphere–Atmosphere–Ionosphere-Coupling (LAIC) mechanism by investigating the Atmospheric Gravity Wave (AGW), magnetic field, electron density, Total Electron Content (TEC), and the energetic particle precipitation in the inner radiation belt. We incorporate two ground-based IGS GPS stations DYNG (Greece) and IZMI (Turkey) for computing the TEC and observed a significant enhancement in daily TEC variation around one week before the earthquake. For the space-based observation, we use multiple parameters as recorded from Low Earth Orbit (LEO) satellites. For the AGW, we use the SABER/TIMED satellite data and compute the potential energy of stratospheric AGW by using the atmospheric temperature profile. It is found that the maximum potential energy of such AGW is observed around six days before the earthquake. Similar AGW is also observed by the method of wavelet analysis in the fluctuation in TEC values. We observe significant energetic particle precipitation in the inner radiation belt over the earthquake epicenter due to the conventional concept of an ionospheric-magnetospheric coupling mechanism by using an NOAA satellite. We first eliminate the particle count rate (CR) due to possible geomagnetic storms and South Atlantic Anomaly (SAA) by the proper choice of magnetic field B values. After the removal of the statistical background CRs, we observe a significant enhancement of CR four and ten days before the mainshock. We use Swarm satellite outcomes to check the magnetic field and electron density profile over a region of earthquake preparation. We observe a significant enhancement in electron density one day before the earthquake. The parameters studied here show an overall pre-seismic anomaly from a duration of ten days to one day before the earthquake.

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“…The parameters related to Total Electron Content (TEC), magnetic field variations in Ultra Low Frequency (ULF) range and other magnetic and resistivity observations have shown anomalous behaviour or changes at the time of occurrence of a few moderate size earthquakes at local epicenteral distance, particularly, within 100 km. Chetia et al (2020a) investigated soil radon (Rn-222) emanation, geomagnetic total field intensity (Btotal) and TEC prior to the September 2018, Kokrajhar (Assam) earthquake of magnitude M w 5.5. It is reported that the anomaly in soil Rn-222 continued for about 50 days (Fig.…”

Section: Earthquake Precursory Studiesmentioning

confidence: 99%

“…8 that in the Darjeeling Himalaya, about 17% of the area falls in "High" susceptible zone, containing 53% of landslides, followed by another 41% of the Fig. 7 The plot shows anomaly in the geomagnetic total field intensity (B total ) at different time period-(A) 16-August-18 to 17-August-18, (B) 18-August-18 to 19-August-18, (C) 26-August-18 to 27-August-18, (D)27-August-18, (E) 28-August-18, (F) 8-September-18 to 9-September-18 and (G) 11-September-18 to 12-September-18 (after Chetia et al 2020a;. The horizontal axis (x-axis) represents the time of the day and vertical axis (y-axis) represents the B total in μT.…”

Section: Landslide Susceptibility Mappingmentioning

confidence: 99%

On mitigation of earthquake and landslide hazards in the eastern Himalayan region

et al. 2022

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Mitigation of geological hazards through science and engineering applications is one of the most effective ways to reduce their impact on human life and local infrastructure. It involves precise mapping of hazards, assessment of their potential, monitoring, early warning, geotechnical treatment, design of vital infrastructural facilities and creating awareness at local levels. Several such initiatives have been taken at government level to deal with the earthquakes and landslides in the eastern Himalayan region. These efforts facilitated identification of potential areas and sites, susceptible to future events and helped in improving our understanding of crustal structure, geodynamics, tectonics, seismogenesis, and soil properties, etc. The paper highlights details of the major initiatives, significant achievements, and priorities to help in better mitigation of earthquake and landslide hazards in the eastern Himalayan region.

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Multi-Parametric Approach for Earthquake Precursor Detection in Assam Valley (Eastern Himalaya, India) using Satellite and Ground Observation Data

Cited by 19 publications

References 32 publications

RST Analysis of Anomalous TIR Sequences in Relation with Earthquakes Occurred in Turkey in the Period 2004–2015

RST Analysis of Anomalous TIR Sequences in Relation with Earthquakes Occurred in Turkey in the Period 2004–2015

Pre-Seismic Irregularities during the 2020 Samos (Greece) Earthquake (M = 6.9) as Investigated from Multi-Parameter Approach by Ground and Space-Based Techniques

On mitigation of earthquake and landslide hazards in the eastern Himalayan region

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