Tide-modulated gas emissions and tremors off SW Taiwan

Hsu, Shu Kun; Wang, Shiou Ya; Liao, Y.C.; Yang, Tsanyao Frank; Jan, Sen; Lin, Jing Yi; Chen, Song Chuen

doi:10.1016/j.epsl.2013.03.013

Cited by 33 publications

(35 citation statements)

References 31 publications

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“…11, a correlation also noted in the time lapse photography and pCO 2 data . This variability with changing hydrostatic pressure is noteworthy and diverse for marine seeps (Schneider von Deimling et al, 2010;Leifer and Boles, 2005a,b;Torres et al, 2002;Heeschen et al, 2005Heeschen et al, , 2003Hsu et al, 2013;Boles et al, 2001). Here, the variability with tidal height is noticeable in the bubble generation rate distributions « (Fig.…”

Section: Correlation With Tidal Heightsmentioning

confidence: 89%

Passive acoustic quantification of gas fluxes during controlled gas release experiments

Bergès

Leighton

White

2015

International Journal of Greenhouse Gas Control

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Section: Correlation With Tidal Heightsmentioning

confidence: 89%

Passive acoustic quantification of gas fluxes during controlled gas release experiments

Bergès

Leighton

White

2015

International Journal of Greenhouse Gas Control

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“…In the past decade, the investigation results from multichannel seismic reflection, chirp sonar and echo sounder profiles point out that fluid activities are frequently observed offshore southwestern Taiwan (Chen et al 2010;Su et al 2012;Hsu et al 2013). The fluid or gas plume located at shallow waters result mainly from submarine groundwater discharge (Su et al 2012) usually forming the weak layers with wipe-out characteristics in chirp sonar profiles.…”

Section: The Feature Of Mass Slope Failure On the Upper Gaoping Slopementioning

confidence: 99%

Sedimentological characteristics and seafloor failure offshore SW Taiwan

Hsu

et al. 2018

Terr. Atmos. Ocean. Sci.

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In this study, analysis results reveal two main deposition zones are located at the flank of upper Gaoping Submarine Canyon and Lower Fangliao Basin offshore SW Taiwan. The non-event related sediments deposited in past 150 years (i.e., 632 Mt km -2 ) was delivered and transported from Gaoping River by suspension process with tides and coastal currents and gradually spread out offshore. Meanwhile, the total mass of accumulation sediments is 1922 Mt km -2 , accounting for 40% Gaoping River's sediment load and suggesting that the deposition process is mainly controlled by natural hazards. Sedimentation rates in much of the study area, except in the main deposition zones, are less than 0.5 cm yr -1 (5 m kyr -1 ). Compared with the studies at the instability seafloor caused by high sedimentation rates (~30 m kyr -1 ), the offshore southwestern Taiwan is relatively stable. In this study, we also discovered a series of sediment waves located on the upper continental slope between Gaoping and Fangliao Submarine Canyons, which is related to the creeping process on seafloor. In summary, our results reveal the fluid activities, existence of weak layers and earthquake triggering are potential factors which might induced seafloor failures offshore southwestern Taiwan.

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“…Gas hydrate may dissociate when the ambient temperature or pressure changes. Even a tidal variation may cause gas hydrate dissociation to some extent and display temporal variation in gas emissions out of the seabed (Hsu et al 2013). The free gas beneath the BSR usually migrates landward and upward to the continental margin, especially when the BSR disappears in shallow water.…”

Section: Introductionmentioning

confidence: 99%

“…The BSR is widely distributed off SW Taiwan (Chi et al 2006;Liu et al 2006), implying high potential for gas hydrate. In fact, numerous gas-related active submarine mud volcanoes, gas seeps and mud diapirs are present in the continental margin off SW Taiwan (Sun and Liu 1993;Liu et al 1997;Chiu et al 2006;Lin et al 2009;Chen et al 2010Chen et al , 2014Hsu et al 2013Hsu et al , 2014. Chen et al (2014) have shown a cluster of active mud volcanoes between the Kaoping (also known as Gaoping) and Fangliao submarine canyons off SW Taiwan (here we name the Kaoping submarine mud volcanoes group or KASMVG) (Fig.…”

Section: Introductionmentioning

confidence: 99%

Seabed gas emissions and submarine landslides off SW Taiwan

Hsu¹,

Lin

Wang³

et al. 2018

Terr. Atmos. Ocean. Sci.

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Methane emissions out of the seabed could seriously affect Earth's climate and are usually associated with the dissociation of gas hydrates stored in marine sediments on the continental margins. Spatially, gas emissions out of the seafloor are not evenly distributed in continental margins. Gas emissions out of the seabed generally occur through submarine mud volcanoes and gas seeps. To understand the seabed gas emissions off SW Taiwan, we investigate the distributions of active submarine mud volcanoes, gas seeps, and gas plumes off SW Taiwan. We examine all of the available sub-bottom profiler and EK echo sounder data. We identified 19 submarine mud volcanoes, 220 gas seeps, and 295 gas plumes. The gas emissions are generally distributed at the crests of mud diapiric ridges. Most of the active mud volcanoes and gas seeps cluster at the KASMVG (Kaoping submarine mud volcanoes group) area. We speculate that the intensive mud volcanism and gas seepage at the KASMVG area are ascribed to submarine channel erosion along the continental slope base. The erosion causes a deep V-shaped channel and a steep BSR (Bottom-Simulating Reflector) slope curve across the continental margin. The upward migration rate of free gas beneath the BSR is thus increased and intensifies mud volcanism and gas seepage at the KASMVG area. The gas seeps can reduce the slope stability and generate small-scale slides. The development of mud volcanoes in an area could effectively disturb the seabed morphology so that large-scale submarine landslides cannot easily happen.

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Tide-modulated gas emissions and tremors off SW Taiwan

Cited by 33 publications

References 31 publications

Passive acoustic quantification of gas fluxes during controlled gas release experiments

Passive acoustic quantification of gas fluxes during controlled gas release experiments

Sedimentological characteristics and seafloor failure offshore SW Taiwan

Seabed gas emissions and submarine landslides off SW Taiwan

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