Aseismic Fault Slip during a Shallow Normal-Faulting Seismic Swarm Constrained Using a Physically-Informed Geodetic Inversion Method

Yu, Jianhua; Samsonov, Sergey; González, Pablo J.

doi:10.1002/essoar.10510181.1

Cited by 3 publications

(3 citation statements)

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“…The closest case is reported by Jiang et al. (2022) in the 2011 Hawthorne seismic swarm, where a significant aseismic slip drives a seismic swarm, leading to an M4.6 mainshock. It may be interesting to perform large‐scale statistics on the candidate pre‐slip clusters like that preceding f 1 in our study. Multiple mechanisms can coexist in a foreshock‐mainshock sequence.…”

Section: Resultsmentioning

confidence: 60%

Seismological Characterization of the 2021 Yangbi Foreshock‐Mainshock Sequence, Yunnan, China: More than a Triggered Cascade

et al. 2022

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Foreshocks are known as smaller earthquakes preceding the large mainshock (Jones & Molnar, 1979). Due to the neighboring location and temporal correlation, foreshocks are considered as a possible precursory phenomenon, for example, the success prediction of 1975 M w 7.0 Haicheng earthquake largely relies on the ∼1-day foreshock activity (Wang et al., 2006). Traditionally, two end-member models are proposed to explain the triggering relationship between the foreshocks and mainshock (Dodge et al., 1996): the cascade model and the pre-slip model. The cascade model describes the seismic sequence as the cascade failure of isolated asperities, where each event is triggered by the stress transfer from the previous earthquake (Ellsworth & Bulut, 2018;Felzer et al., 2004;

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Section: Resultsmentioning

confidence: 60%

Seismological Characterization of the 2021 Yangbi Foreshock‐Mainshock Sequence, Yunnan, China: More than a Triggered Cascade

et al. 2022

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“…At the same time, natural swarms are also accompanied by aseismic slip release, as revealed by geodesy and slip inversions (Gualandi et al., 2017; Hamiel et al., 2012; Jiang et al., 2022; Lohman & McGuire, 2007; Ruhl et al., 2016), or by studying velocity migrations and repeating earthquakes like during the 2015 swarm in the Gulf of Corinth, Greece (De Barros et al., 2020), or during a complex swarm in Nevada, USA (Hatch et al., 2020). The effective stress drop, defined for the full swarms by analogy with the stress drop for a single earthquake, is usually found to be low (0.01–1 MPa) for earthquake swarms (Fischer & Hainzl, 2017; Roland & McGuire, 2009), which is interpreted as indicative of aseismic deformation within the swarms.…”

Section: Introductionmentioning

confidence: 96%

Prevalence of Aseismic Slip Linking Fluid Injection to Natural and Anthropogenic Seismic Swarms

et al. 2022

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Anthropogenic fluid injections at depth induce seismicity which is generally organized as swarms, clustered in time and space, with moderate magnitudes. Earthquake swarms also occur in various geological contexts such as subduction zones, mountain ranges, volcanic, and geothermal areas. While some similarities between anthropogenic and natural swarms have already been observed, whether they are driven by the same mechanism, or by different factors, is still an open question. Fluid pressure diffusion or aseismic deformation processes are often proposed to explain observations of hypocenters migration during swarms, while recent models suggest that swarm seismicity is rather triggered by fluid‐induced aseismic fault slip. Here, using a global compilation of 22 natural and anthropogenic swarms, we observe that duration, migration velocity, and total moment scale similarly for all swarms. This supports a common driving process for both natural and induced swarms. The scaling relations are similar to those found for slow slip events. These observations highlight the prevalence of fluid‐induced aseismic slip as main driver of earthquakes migration during swarms. After quantifying aseismic slip released in the swarms, we propose an approach to estimate the seismic‐to‐total moment ratio, which we then compare to a theoretical estimation that depends on the migration velocity of the swarm and the effective stress drop. Our findings lead to a generic explanation of the process driving earthquake swarms that might open new possibilities to monitor seismic swarms.

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“…The seismicity evolution during a swarm is often thought to be governed by external aseismic processes such as a slow slip event, fluid flow, magma intrusion, or a combination. Transient aseismic fault slip in the form of a slow slip event can increase shear stress on neighboring fault patches and has in particular been associated with swarms along oceanic transform faults (e.g., Roland & McGuire, 2009) and extensional or transtensional continental fault systems (e.g., Gualandi et al., 2017; Jiang et al., 2022; Lohman & McGuire, 2007; Martínez‐Garzón et al., 2021; Passarelli et al., 2015). Alternatively, elevated pore pressure from fluid flow or magmatic intrusion can decrease effective normal stress, thus reducing fault strength and bringing the faults closer to failure (e.g., Dieterich et al., 2000; Hubbert & Rubey, 1959; Nur & Booker, 1972).…”

Section: Introductionmentioning

confidence: 99%

The 2020 Westmorland, California Earthquake Swarm as Aftershocks of a Slow Slip Event Sustained by Fluid Flow

et al. 2022

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Earthquakes are often seen to cluster in time and space. Many clusters have a clearly identifiable mainshock followed by numerous smaller aftershocks. Others occur as a sustained burst of small magnitude earthquakes lasting from hours to several years without an obvious mainshock, referred to as a swarm (Mogi, 1963). The peak seismicity rate during swarms can reach >10,000 times the background level with complex temporal evolution that cannot be explained by the simple Omori-Utsu type power-law decay (Omori, 1894;Utsu, 1961) typical of mainshock-aftershock sequences (Holtkamp & Brudzinski, 2011;Vidale & Shearer, 2006). Swarms also often expand spatially (X. Chen et al., 2012) with a velocity ranging from m/day (e.g., Ross et al., 2020) to km/hr (e.g., Roland & McGuire, 2009). Swarms can occur in a wide range of geological settings, such as volcanoes (e.g.,

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Aseismic Fault Slip during a Shallow Normal-Faulting Seismic Swarm Constrained Using a Physically-Informed Geodetic Inversion Method

Cited by 3 publications

References 81 publications

Seismological Characterization of the 2021 Yangbi Foreshock‐Mainshock Sequence, Yunnan, China: More than a Triggered Cascade

Seismological Characterization of the 2021 Yangbi Foreshock‐Mainshock Sequence, Yunnan, China: More than a Triggered Cascade

Prevalence of Aseismic Slip Linking Fluid Injection to Natural and Anthropogenic Seismic Swarms

The 2020 Westmorland, California Earthquake Swarm as Aftershocks of a Slow Slip Event Sustained by Fluid Flow

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