Groundwater oxygen isotope anomaly before the M6.6 Tottori earthquake in Southwest Japan

Onda, Satoki; Sano, Yuji; Takahata, Naoto; Kagoshima, Takanori; Miyajima, Toshihiro; Shibata, Tomo; Pinti, Daniele L.; Lan, Tefang; Kim, Nak Kyu; Kusakabe, Minoru; Nishio, Yoshiro

doi:10.1038/s41598-018-23303-8

Cited by 35 publications

(40 citation statements)

References 25 publications

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“…The [Na+K]/Si, Na/K, and [Na+K]/Ca ratios as well as conductivity, alkalinity, and Cl concentrations began increasing 3-5 weeks before the Mw 5.3 earthquake whereas the Ba/Sr ratio began decreasing 3-6 days before the Mw 5.0 earthquake (Skelton et al, 2008). In 2017, oxygen isotopic ratio anomalies of +0.24 0 / 00 relative to the local background were recorded in groundwater a few months before the Mw 6.6 Tottori earthquake in southwest Japan (5 km from the epicenter; Onda et al, 2018).…”

Section: Previous Useful Resultsmentioning

confidence: 99%

The Bortoluzzi Mud Volcano (Ionian Sea, Italy) and its potential for tracking the seismic cycle of active faults

Cuffaro¹,

Billi²,

Bigi³

et al. 2018

Preprint

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Abstract. The Ionian Sea in southern Italy is at the center of active interaction and convergence between the Eurasian and African-Adriatic plates in the Mediterranean. This area is seismically active with instrumentally/historically-recorded Mw > 7.0 earthquakes and it is affected by recently-discovered long strike-slip faults across the active Calabrian accretionary wedge. Many mud volcanoes occur on top of the wedge. A recently-discovered one (here named Bortoluzzi Mud Volcano, BMV) was surveyed during the Seismofaults 2017 cruise (May 2017). Bathymetric-backscatter surveys, seismic reflection profiles, geochemical and earthquake data as well as a gravity core are here used to geologically, geochemically, and geophysically characterize this structure. The BMV is a circular feature ≃22 m high and ≃1100 m in diameter with steep slopes (up to a dip of 22°). It sits atop the Calabrian accretionary wedge and a system of flower-like oblique-slip faults that are probably seismically active as demonstrated by earthquake hypocentral and focal data. Geochemistry of water samples from the seawater column on top of the BMV shows a significant contamination of the bottom waters from saline (evaporite-type) CH4-dominated crustal-derived fluids similar to the fluids collected from a mud volcano located in the Calabria main land over the same accretionary wedge. These results attest for the occurrence of an open crustal conduit through the BMV down to at least the Messinian evaporites at about −3000 m. This evidence is also substantiated by Helium isotope ratios and by different geochemical data from three sea water columns located elsewhere in the Ionian Sea. Conclusions are drawn on the origin of the BMV and on the potential of this type of structures for tracking the seismic cycle of active faults. Due to the widespread diffusion of mud volcanoes in seismically active settings, this study may contribute to indicate a potential and feasible future path for the use of these ubiquitous structures in favor of the mitigation of natural hazards.

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Section: Previous Useful Resultsmentioning

confidence: 99%

The Bortoluzzi Mud Volcano (Ionian Sea, Italy) and its potential for tracking the seismic cycle of active faults

Cuffaro¹,

Billi²,

Bigi³

et al. 2018

Preprint

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show abstract

“…Then, one of us (Tiziana Sgroi) manually picked the most recent earthquakes (2013-2017) following the same procedure adopted by the analysts of ISC 1985and ISB 2003 Combining the picked arrival time data with the arrival time data from the analyzed bulletins, Tiziana Sgroi relocated all earthquakes (Table S1 in the Supplement). Moreover, to understand the kinematics of the seismic faulting, we collected earthquake focal mechanisms (Table S2) from the European-Mediterranean Regional Centroid-Moment Tensor (RCMT) catalog (http://rcmt2.bo.ingv.it/, last access: 15 May 2019) and from previous papers by Orecchio et al (2014) and Polonia et al (2016). Earthquake data (Tables S1 and S2) are shown in map view in Figs.…”

Section: Earthquakesmentioning

confidence: 99%

“…Earthquake epicenters and focal mechanisms (Tables S1 and S2) surrounding the BMV area are shown as dots (black and white) and beach balls, respectively. Focal mechanisms (Table S2) are from the European-Mediterranean Regional Centroid-Moment Tensor (red beach ball) catalog (http://rcmt2.bo.ingv.it/, last access: 15 May 2019) and from previous papers (blue beach balls) by Orecchio et al (2014) and Polonia et al (2016). White dots represent the selected seismic events at an arbitrary distance of 12 km to be projected along the transect A-A' (blue line).…”

Section: Bathymetry and Geomorphologymentioning

confidence: 99%

“…10c, respectively. Earthquake epicenters (epicenters are indicated by thin grey dots and focal mechanisms by beach balls) surrounding the BMV area were relocated in this work, whereas focal mechanisms are from the European-Mediterranean Regional Centroid-Moment Tensor (RCMT) catalog (http://rcmt2.bo.ingv.it/, last access: 15 May 2019) (red beach ball) and from previous papers (blue beach balls) by Orecchio et al (2014) and Polonia et al (2016). Faults are principally from Polonia et al (2011Polonia et al ( , 2016 and Bortoluzzi et al (2017).…”

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confidence: 99%

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The Bortoluzzi Mud Volcano (Ionian Sea, Italy) and its potential for tracking the seismic cycle of active faults

et al. 2019

View full text Add to dashboard Cite

Abstract. The Ionian Sea in southern Italy is at the center of active interaction and convergence between the Eurasian and African–Adriatic plates in the Mediterranean. This area is seismically active with instrumentally and/or historically recorded Mw>7.0 earthquakes, and it is affected by recently discovered long strike-slip faults across the active Calabrian accretionary wedge. Many mud volcanoes occur on top of the wedge. A recently discovered one (called the Bortoluzzi Mud Volcano or BMV) was surveyed during the Seismofaults 2017 cruise (May 2017). High-resolution bathymetric backscatter surveys, seismic reflection profiles, geochemical and earthquake data, and a gravity core are used here to geologically, geochemically, and geophysically characterize this structure. The BMV is a circular feature ≃22 m high and ≃1100 m in diameter with steep slopes (up to a dip of 22∘). It sits atop the Calabrian accretionary wedge and a system of flower-like oblique-slip faults that are probably seismically active as demonstrated by earthquake hypocentral and focal data. Geochemistry of water samples from the seawater column on top of the BMV shows a significant contamination of the bottom waters from saline (evaporite-type) CH4-dominated crustal-derived fluids similar to the fluids collected from a mud volcano located on the Calabria mainland over the same accretionary wedge. These results attest to the occurrence of open crustal pathways for fluids through the BMV down to at least the Messinian evaporites at about −3000 m. This evidence is also substantiated by helium isotope ratios and by comparison and contrast with different geochemical data from three seawater columns located over other active faults in the Ionian Sea area. One conclusion is that the BMV may be useful for tracking the seismic cycle of active faults through geochemical monitoring. Due to the widespread diffusion of mud volcanoes in seismically active settings, this study contributes to indicating a future path for the use of mud volcanoes in the monitoring and mitigation of natural hazards.

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“…Therefore, it is imperative to conduct research in this direction to mitigate the associated geohazards and minimize the loss of life and property. In this regard, numerous retrospective studies highlight the presence of atmospheric, ionospheric, and hydrogeochemical processes accompanied by earthquake activity [5][6][7][8][9][10][11][12][13][14][15][16]. These accompanying processes are considered as earthquake precursors and observed globally [11,14,[17][18][19][20][21][22][23].…”

Section: Introductionmentioning

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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Groundwater oxygen isotope anomaly before the M6.6 Tottori earthquake in Southwest Japan

Cited by 35 publications

References 25 publications

The Bortoluzzi Mud Volcano (Ionian Sea, Italy) and its potential for tracking the seismic cycle of active faults

The Bortoluzzi Mud Volcano (Ionian Sea, Italy) and its potential for tracking the seismic cycle of active faults

The Bortoluzzi Mud Volcano (Ionian Sea, Italy) and its potential for tracking the seismic cycle of active faults

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

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