Fractal Analysis of Earthquake Sequences in the Ibero-Maghrebian Region

Hamdache, Mohamed; Henares, Jesús; Peláez, José A.; Damerdji, Y.

doi:10.1007/s00024-018-2072-x

Cited by 14 publications

(11 citation statements)

References 49 publications

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“…Regarding the central region, different sequences have been historically reported in Granada, in 1778 and 1806–1807 (Ocaña, 2009; Sempere, 1807). Recent seismic sequences include Iznájar in 1998 (Carmona et al., 2009), Loja in 1985 and 2000 (Hamdache et al., 2019; SIS, 2022), and Albuñol between 2000 and 2001 (Ocaña, 2009; SIS, 2022).…”

Section: Geological and Seismological Settingmentioning

confidence: 99%

“…Swarms are often related to volcanic phenomena (Benoit & McNutt, 1996; Endo et al., 1981; Hill, 1977; Hurst & McGinty, 1999; McNutt, 1996; Power et al., 1994; among others) and geothermal regions (Dziak et al., 2003; Hainzl & Fischer, 2002). However, they can also occur in tectonically active contexts, whether on plate boundaries (e.g., Hamdache et al., 2019, 2016; Llenos et al., 2009; Lohman & McGuire, 2007; Vidale et al., 2006; Vidale & Shearer, 2006) or interplate rifts (e.g., Ibs‐von Seht et al., 2008; Stankova et al., 2008). This type of seismic sequence is often attributed to areas of the crust with many heterogeneities (Udías & Mezcua, 1986), to hidden influence of fluids (Hatch et al., 2020; Špičák et al., 2005), or to near aseismic fault‐slip (Hatch et al., 2020; McGuire et al., 2005; Roland & McGuire, 2009), and are often characterized by a hypocenter migration (e.g., Hainzl, 2004; Hayashi & Morita, 2003; Kyriakopoulos et al., 2013; Waite & Smith, 2002).…”

Section: Introductionmentioning

confidence: 99%

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The Role of Faults as Barriers in Confined Seismic Sequences: 2021 Seismicity in the Granada Basin (Betic Cordillera)

et al. 2022

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Fault barriers are key structures for studying seismic hazard in regions of intense brittle deformation. The interaction between fault sets affects their seismogenic behavior, if some of them act as barriers. The Granada Basin, in the Betic Cordillera, is a region affected by shallow brittle deformation, as it was the scenario for the recent Granada 2021 seismic sequence. This seismicity presented a swarm behavior at the beginning of the sequence, followed by mainshock‐aftershock features. Geological and gravity data presented here reveal that the basement is affected by two sets of NW‐SE and NE‐SW normal faults and intensely deformed by vertical NW‐SE joints. Improved relocation of the Granada 2021 seismicity reveals a confined chimney‐shape seismicity caused by the activity of a 2 km long NW‐SE normal fault segment. The confinement of the sequence is associated with the NE‐SW fault set acting as a barrier that restricts the rupture area, limiting the maximum magnitude, and favoring the recurrence of events with smaller magnitude. The chimney‐shape of the seismic sequence suggests that the deformation is propagated vertically to the surface, facilitated by preexisting fractures. The shallow extensional deformation during the uplift of the central Betic Cordillera drove the activity of the local structures obliquely to the regional extensional trends, as evidenced by the seismic sequence. This multidisciplinary study improves the knowledge on the origin of the Granada Basin and underlies the important role of preexisting fractures on fault segmentation and seismic propagation, decreasing the seismic potential of this area.

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Section: Geological and Seismological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Role of Faults as Barriers in Confined Seismic Sequences: 2021 Seismicity in the Granada Basin (Betic Cordillera)

et al. 2022

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“…In Eq. (3), / i ; b i ð Þare the coordinates the of earthquake event, and / j ; b j À Á are the coordinates of the radonmonitoring stations (Hamdache et al, 2019). For a reliable identification of an earthquake anomaly, the monitoring station must be within the EPZ.…”

Section: Earthquake Activitymentioning

confidence: 99%

Fluctuation Dynamics of Radon in Groundwater Prior to the Gansu Earthquake, China (22 July 2013: Ms = 6.6): Investigation with DFA and MFDFA Methods

Alam

Wang

Petraki

et al. 2021

Pure Appl. Geophys.

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The present study reports measurements of radon in groundwater conducted in China between January and December 2013. During the measurement period, a great M s = 6.6 earthquake occurred in Gansu Province, China. The paper analyses data derived from three nearby stations via monofractal and multifractal detrended fluctuations analysis and explores whether pre-earthquake fractal and long-memory trends exist in the time series. Several critical epochs with characteristic pre-seismic long-lasting fractal patterns are identified in segmented parts of the series. In the whole data series, the fluctuation function, scaling exponent and generalised Hurst exponent depend on the fractal scales, which indicates multifractality. The multifractal spectrum of the raw, shuffled and truncated series showed a significant increase in the degree of fluctuation that can be explained as a pre-earthquake indicator attributable to the Gansu earthquake due to its very large magnitude.

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“…Here, α i , β i are the coordinates of the earthquake event, α j , β j are the coordinates of the Rn monitoring station, and R ≈ 6370 km is the earth's radius [58]. In an ideal scenario, only those events having R E /R D ≤ 1 are considered for earthquake forecasting studies.…”

Section: Identification Of Radonmentioning

confidence: 99%

Implication of Radon Monitoring for Earthquake Surveillance Using Statistical Techniques: A Case Study of Wenchuan Earthquake

et al. 2020

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The seismotectonically induced changes in groundwater radon (Rn) are considered to be strong imputes for the surveillance of imminent major earthquakes. Groundwater facilitates the migration of soil gases as a result of tectonic stresses. In this regard, a radon time series is statistically analysed to identify the radon anomalies possibly induced by Wenchuan earthquake. The statistical analysis mainly involves the deterministic analysis of the Rn data and residual Rn analysis using a criterion x¯±2σ of anomaly selection having a confidence interval of 95%. The deterministic analysis reveals that the Rn time series follows a persistent trend 0.5≤H≤1 which confirms the absence of a chaotic regime. On the other hand, the residual Rn shows a notable upsurge straddling the time of the Wenchuan earthquake in the form of pre- and post earthquake changes at monitoring stations having RE/RD≤0.3. The residual Rn level passes the anomaly selection criterion x¯±2σ and is declared as a tectonically induced Rn anomaly. Contrary to this, the response of distant monitoring stations (RE/RD>0.3) to this particular earthquake further validates the link between Rn and earthquake activity. In a nutshell, the present study highlights the potential implications of earthquake-induced radon anomalies for earthquake prediction research.

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Fractal Analysis of Earthquake Sequences in the Ibero-Maghrebian Region

Cited by 14 publications

References 49 publications

The Role of Faults as Barriers in Confined Seismic Sequences: 2021 Seismicity in the Granada Basin (Betic Cordillera)

The Role of Faults as Barriers in Confined Seismic Sequences: 2021 Seismicity in the Granada Basin (Betic Cordillera)

Fluctuation Dynamics of Radon in Groundwater Prior to the Gansu Earthquake, China (22 July 2013: Ms = 6.6): Investigation with DFA and MFDFA Methods

Implication of Radon Monitoring for Earthquake Surveillance Using Statistical Techniques: A Case Study of Wenchuan Earthquake

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