Fractal Seismicity and Coulomb Stress Pattern Analysis for 7 January 2020 Mw 6.4 Puerto Rico Earthquake

Mangalagiri, Tejaswini; Chandriyan, Haritha; Roy, P.N.S.

doi:10.1785/0220220031

Cited by 3 publications

References 40 publications

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Decoding self-similar earthquake patterns and static stress: a study on major California earthquakes

Chandriyan,

Reddy,

Roy

2024

Nat Hazards

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This study investigates the collaborative application of fractal clustering patterns and cumulativeCoulomb stress (CCS) in the context of earthquake precursory signal identi cation. We evaluated CCS created by the events based on the period when the Correlation fractal dimension (Dc) commenced falling into relatively lower values. We tested this approach to four strong (M > 7) earthquakes of southern and Baja California, revealing a correlation between these parameters. The crustal readjustment period prior to large earthquakes frequently exhibits a succession of events that result in positive CCS and a higher degree of spatial clustering, indicating low Dc. Preceding strong earthquakes, positive CCS values have been observed concurrently with the onset of low Dc, indicating the potential signi cance of Dc in seismic hazard assessment studies. We examined these parameters in the Ridgecrest and Baja California regions following the 2010 Mw 7.2 and 2019 M w 7.1 events. Signs of strain were observed in the northwestern region of the epicenters, indicated by the presence patch of low Dc and positive CCS. We observed that earthquake frequency is typically highest in regions with low to medium Dc values. Multiple sections of the Garlock Fault, manifested by low Dc regions, are loaded, posing a signi cant seismic risk in Southern California. Similarly, the southern segment of the San Andreas fault displays demonstrate low Dc and high stress, has been inactive for a prolonged period. While these faults may be inactive, we must not underestimate the unpredictability of earthquakes.

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Decoding self-similar earthquake patterns and static stress: a study on major California earthquakes

Chandriyan,

Reddy,

Roy

2024

Nat Hazards

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Tectonic Duets: Self-Similar Approach to Investigate Eastern Anatolian Fault’s Recent Seismicity, with Special Emphasis on the 6 February 2023 Earthquake Doublet

Chandriyan,

Roy

2024

Seismological Research Letters

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Earthquake clusters possess profound potential for discerning antecedent seismic cues. This study examines the self-similarity of earthquakes to characterize recent seismic patterns in the prolonged quiescent Eastern Anatolian fault zone (EAFZ). We thoroughly investigate the correlation fractal dimension (Dc) formulated upon the scale-invariant relative clustering in earthquake pattern identification. We provide a comprehensive examination of pre- and postseismicity patterns of the Mw 7.7 Nurdağı-Pazarcık, Mw 7.6 Ekinözü, and Mw 6.7 Elazığ earthquakes, each shattering different segments of the EAFZ. The spatiotemporal fluctuations of Dc suggest the commencement of the preparatory process observed around October 2021 to February 2022 for the 2023 dual catastrophe, whereas in the case of the Mw 6.7 Elazığ, this was witnessed from November 2018. Prior to the 2023 events, low-moderate Dc regions predominated on the Pazarcık segment and Cardak fault. The Pürtürge segment that ruptured with an Mw 6.7 event was within a low Dc area. We identified a consistent relationship between stress levels and Dc for the 2023 twin events and the Mw 6.7 earthquake, with low Dc indicative of high stress. Intriguingly, mainshocks and a substantial proportion of their aftershocks have occurred within areas characterized by low to moderate Dc. Various fault zones like Malatya, Amanos, and Adiyaman are situated in areas with low Dc. The southwestern area of the Amanos segment exhibits clustering, elevated stress levels, and low Dc, followed by the Mw 7.7. Therefore, it is imperative to maintain vigilant monitoring of this region to prevent another disaster.

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Decoding Self-similar Earthquake Patterns and Static Stress; a Pathway to Enhanced Earthquake Forecasting

Chandriyan,

Reddy,

Roy

2024

Preprint

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This study investigates the collaborative application of fractal clustering patterns and cumulative Coulomb stress (CCS) in the context of earthquake precursory signal identification. We evaluated CCS created by the events based on the period when the Correlation fractal dimension (Dc) commenced falling into relatively lower values. We tested this approach to four strong (M > 7) earthquakes of southern and Baja California, revealing a correlation between these parameters. The crustal readjustment period prior to large earthquakes frequently exhibits a succession of events that result in positive CCS and a higher degree of spatial clustering, indicating low Dc. Preceding strong earthquakes, positive CCS values have been observed concurrently with the onset of low Dc, indicating the potential significance of Dc in seismic hazard assessment studies. We examined these parameters in the Ridgecrest and Baja California regions following the 2010 Mw 7.2 and 2019 Mw 7.1 events. Signs of strain were observed in the northwestern region of the epicenters, indicated by the presence patch of low Dc and positive CCS. We observed that earthquake frequency is typically highest in regions with low to medium Dc values. Multiple sections of the Garlock Fault, manifested by low Dc regions, are loaded, posing a significant seismic risk in Southern California. Similarly, the southern segment of the San Andreas fault displays demonstrate low Dc and high stress, has been inactive for a prolonged period. While these faults may be inactive, we must not underestimate the unpredictability of earthquakes.

show abstract

Fractal Seismicity and Coulomb Stress Pattern Analysis for 7 January 2020 Mw 6.4 Puerto Rico Earthquake

Cited by 3 publications

References 40 publications

Decoding self-similar earthquake patterns and static stress: a study on major California earthquakes

Decoding self-similar earthquake patterns and static stress: a study on major California earthquakes

Tectonic Duets: Self-Similar Approach to Investigate Eastern Anatolian Fault’s Recent Seismicity, with Special Emphasis on the 6 February 2023 Earthquake Doublet

Decoding Self-similar Earthquake Patterns and Static Stress; a Pathway to Enhanced Earthquake Forecasting

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