Long duration non-volcanic and non-tectonic Palghar earthquake swarm in the stable continental region of India—role of seasonal rainfall and earthquake cascading

Gahalaut, Kalpna; Gahalaut, Vineet K.; Naresh, B.; Shekar, M.; Sunilkumar, T. C.; Srinagesh, D.

doi:10.1007/s10950-022-10087-8

Cited by 8 publications

(9 citation statements)

References 34 publications

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“…Surprisingly, in both cases, the short-period tidal modulation is lacking. Rather, the Koyna-Warna seismic zone and the Palghar seismic zone exhibit strong annual and semi-annual periodicity 38 , 39 , which have been linked to the reservoir water level variation and seasonal rainfall-induced hydrological loading, respectively (Fig. 1 b, Figs.…”

Section: Resultsmentioning

confidence: 99%

Gravity-induced seismicity modulation on planetary bodies and their natural satellites

Senapati,

Kundu,

Jha

et al. 2024

Sci Rep

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Ground-based monitoring of seismicity and modulation by external forces in the field of planetary seismology remains equivocal due to the lack of natural observations. Constrained by the natural observations (including Earthquakes, Moonquakes, and Marsquakes) and theoretical models, we present the variation in gravitational acceleration “g” of different solar system objects, combined with external harmonic forcings that are responsible for seismicity modulation on the planetary bodies and their natural satellites. From the global diversity in seismicity modulation, it has been observed that the plate-boundary regions on the Earth exhibit both short and long-period seismicity modulation. In contrast, the stable plate interior regions appear to be more sensitive to long-period seismicity modulation, however, lacking in short-period modulation. The deep Moonquakes are susceptible for both the lunar tidal period (13.6 days and 27 days) and long-period pole wobble modulation (206 days), whereas shallow emergent type moonquakes show a seismic periodicity at the lunation period (29.5 days). Further, the seasonal variation with an annual seismicity burst and seismic periodicity at polar wobble periods for high-frequency Marsquakes captured by InSight lander indicate a natural origin. Whereas diurnal and semi-diurnal periodicity along with Phobos’ tidal period, indicate possible artifacts due to different detection probabilities and non-seismic noise in the Martian environment. We argue that, in the context of rate-state-dependent fault friction, the gravity-induced resonance destabilization model appears to be better agreement with the contrast and relative diversity in seismicity modulation linked to the Earth, Moon, and Mars.

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Section: Resultsmentioning

confidence: 99%

Gravity-induced seismicity modulation on planetary bodies and their natural satellites

Senapati,

Kundu,

Jha

et al. 2024

Sci Rep

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“…In order to understand the ∆CF F effect due to earthquakes in one cluster on to the seismogenic faults of other clusters, we performed simple but representative modeling using the Coulomb 3.3 software (Lin & Stein, 2004;Toda et al, 2005), ignoring the possibility of co-seismic porepressure change. We used a cumulative fault source in a cluster following the approach of Gahalaut et al (2004Gahalaut et al ( , 2022. We modeled ∆CF F due to slip on the NNE-SSW oriented normal fault, simulating a typical earthquake cluster source of the Jektvik swarm.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, small increase in ∆CF F can trigger the swarm activity. Pore-pressure changes due to load changes and coseismic processes are likely to play a role and can further promote failure (Gahalaut et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

“…In addition, hydrological load changes from water bodies, soil moisture and snow cause elastic deformation, which often is observable in GNSS data (e.g., Drouin et al, 2016;Springer et al, 2019). The load change can be significant enough to modulate stresses, pore-pressure and eventually seismic rupture, as suggested by Hainzl et al (2006); Craig et al (2017); Gahalaut et al (2022). Possible links between hydrological processes and swarms have been inferred in various intraplate regions, notably Mt.…”

Section: Introductionmentioning

confidence: 99%

“…Possible links between hydrological processes and swarms have been inferred in various intraplate regions, notably Mt. Hochstaufen in Germany (Hainzl et al, 2006), New Madrid in the USA (Bisrat et al, 2012), and Palghar in Western India (Sharma et al, 2020;Gahalaut et al, 2022). In order to investigate the possible role of hydrological processes in Nordland, we first need to characterize precisely the spatio-temporal evolution of seismicity -something that has not been possible until now.…”

Section: Introductionmentioning

confidence: 99%

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Seismicity modulation due to hydrological loading in a stable continental region: a case study from the Jektvik swarm sequence in Northern Norway

Shiddiqi¹,

Ottemöller²,

Rondenay³

et al. 2022

Preprint

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Seismic swarms have been observed for more than 40 years along the coast of Nordland, Northern Norway. However, the detailed spatio-temporal evolution and mechanisms of these swarms have not yet been resolved due to the historically sparse seismic station coverage. An increased number of seismic stations now allows us to study a nearly decade-long swarm sequence in the Jektvik area during the 2013-2021 time window. Our analysis resolves four major groups of events, each consisting of several spatial clusters, that have distinct spatial and temporal patterns. Computed focal mechanism solutions are predominantly normal with NNE-SSW strike direction reflecting a near-vertical maximum principal stress and a NW-SE near-horizontal minimum principal stress, which are controlled by local NW-SE extension. We attribute the swarm sequence to fluid-saturated fracture zones that are reactivated due to this local extension. Over the time period, the activity tends to increase between February and May, which coincides with the late winter and beginning of spring time in Norway. We hypothesize that the seismicity is modulated seasonally by hydrological loading from snow accumulation. This transient hydrological load results in elastic deformation that is observed at local GNSS stations. The loading is shown to promote failure in a critically stressed normal faulting system. Once a segment is activated, it can then also trigger neighboring segments via stress transfer. Our new results point to a close link between lithosphere and hydrosphere contributing to the occurrence of seismic swarm activity in northern Norway.

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Significance of VP/VS ratio in locating earthquakes of a long-duration swarm in the western coast of India

Paul,

Sunilkumar,

Gahalaut

et al. 2024

J Seismol

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Long duration non-volcanic and non-tectonic Palghar earthquake swarm in the stable continental region of India—role of seasonal rainfall and earthquake cascading

Cited by 8 publications

References 34 publications

Gravity-induced seismicity modulation on planetary bodies and their natural satellites

Gravity-induced seismicity modulation on planetary bodies and their natural satellites

Seismicity modulation due to hydrological loading in a stable continental region: a case study from the Jektvik swarm sequence in Northern Norway

Significance of VP/VS ratio in locating earthquakes of a long-duration swarm in the western coast of India

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