Evidence for a magma reservoir beneath the Taipei metropolis of Taiwan from both S-wave shadows and P-wave delays

Lin, Cheng‐Horng

doi:10.1038/srep39500

Cited by 48 publications

(47 citation statements)

References 20 publications

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“…Recent observations about volcanic activities suggest that there are even younger, Holocene volcanic events in the NTVZ area, and hydrothermal activities in the Tatun Volcanic Group area are still very common at present [40,41]. New seismological evidence clearly indicates that a deep magma reservoir is beneath Taipei [42]. Also, increasing active submarine volcano, gas plumes, and topography lineaments have been identified in the offshore area [43][44][45].…”

Section: Late Neogene Basin Of North Offshore Taiwanmentioning

confidence: 99%

Seismic Stratigraphic Features of the Late Miocene-Present Unconformities and Related Seismic Units, Northern Offshore Taiwan

Chang¹,

Yang²,

Hsu³

et al. 2017

Seismic and Sequence Stratigraphy and Integrated Stratigraphy - New Insights and Contributions

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We investigate the seismic stratigraphic features offshore northern Taiwan by using newly collected multichannel seismic data. Two significant regional unconformities U1 and U2 have been identified, which further subdivide the sedimentary sequence into three seismic units as SU I, SU II, and SU III. The lowermost seismic unit SU I is a pre-late Miocene sequence, while the middle and upper seismic unit SU II and SU III result from the interactions between the rapid fault-controlled subsidence and the stable thermal-controlled subsidence. We consider that the present-day offshore northern Taiwan is under a post-collisional state and the unconformities U1 and U2 represent a response to the mountain collapse and to the cessation of the regional volcano-tectonic activities. It is not until 1.5 Ma that northern offshore Taiwan became a post-collisional basin and started to receive sediments, with a rapid fault-controlled subsidence. Afterward, the basin became dominated by a stable thermal-controlled subsidence at 0.2 Ma. Although the main volcano-tectonic activities in the northern offshore Taiwan are ceased, modern geophysical and geochemical investigations have suggested that the tectonism and the volcanism are still active and represent potential threatening geohazard.

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Section: Late Neogene Basin Of North Offshore Taiwanmentioning

confidence: 99%

Seismic Stratigraphic Features of the Late Miocene-Present Unconformities and Related Seismic Units, Northern Offshore Taiwan

Chang¹,

Yang²,

Hsu³

et al. 2017

Seismic and Sequence Stratigraphy and Integrated Stratigraphy - New Insights and Contributions

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“…However, geological and seismological evidences has been recently obtained, suggest that submarine Piip volcano in western Aleutians as well as Tatun volcanic group in northern Taiwan are active (Yogodzinski et al, 1994;Belousov et al, 2010;Zellmer et al, 2015). Tatun volcano last erupted about 6000 years ago and underlain by a chamber of molten magma at a depth 30 km (Lin, 2016).…”

Section: Past and Future Eruptions In Myanmarmentioning

confidence: 99%

Holocene eruptions of Mt. Popa, Myanmar: Volcanological evidence of the ongoing subduction of Indian Plate along Arakan Trench

Belousov

Belousova

Zaw

et al. 2018

Journal of Volcanology and Geothermal Research

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In the western part of Myanmar the geodetic and seismic data indicate the ongoing highly oblique subduction of Indian Plate under Eurasian Plate. Volcanoes of Burma arc, however, did not produce eruptions in the recorded history and are considered extinct. Such perception questions the ongoing subduction, as well as keeping local officials unaware of possibility of future volcanic eruptions in the country. We have investigated the youngest lava flows and pyroclasts of Mt. Popa, which is the best-preserved polygenetic volcanic edifice in Myanmar. The Ar/Ar dating of the youngest products of the volcano provided very young radiometric ages which were unable to be measured accurately. The radiocarbon dating of paleosols intercalated with the most recent ash layers of the volcano has shown that Mt. Popa produced several eruptions in the beginning of Holocene. The youngest eruption occurred~8000 BP and included the 1.3 km 3 gravitational collapse of the volcanic cone with deposition of the 11-km-long debris avalanche, immediately followed by emplacement of 0.1 km 3 of pyroclastic flow of calcalkaline basaltic andesite composition. The collapse direction as well as complex morphology of the resulted crater were prearranged by geometry of the listric fault, which was formed during the pre-collapse asymmetric gravitational spreading of the volcanic cone. The recently erupted products are geochemically similar to products of young monogenetic volcanoes of Monywa area located 150 km north Mt. Popa, and both display patterns consistent with magma generation at an active subduction system. Low magma production rate of Mt. Popa (3 × 10 −-5 km 3 /year averaged for the 1 Ma of the volcano history) is in agreement with the highly oblique angle and slow rate of the subduction. The fact of the Holocene eruptions of calc-alkaline composition in Burma arc represents volcanological evidence of the ongoing subduction in this part of the collision zone between India and Asia.

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“…Two operational nuclear power plants are on the flanks of TVG. A magma chamber may still exist below TVG, based on four pieces of evidence: (1) compositional gases Witt et al 2008), (2) volcano-induced seismicity (Kim et al 2005;Lin et al 2005), (3) observational ground deformations (Chang et al 2014), and (4) S-wave shadowing (Lin 2016). Presently, TVG mostly shows hydrothermal activities, whose intensities seemed to rise between 2004 and 2007 Rontogianni et al 2012;Mouyen et al 2016).…”

Section: Gravity Changes At Dormant Active and Extinct Volcanoes Inmentioning

confidence: 99%

“…These three AG values show a steady decline at a rate of -1.54 ± 1.18 μGal yr -1 (see the second-stage gravity rate in Table 3) after correcting for the gravity effect of vertical displacements that have a rate of 0.55 cm yr -1 based on a nearby GPS site SUN1. The large uncertainty (1.18 μGal yr -1 ) of the estimated gravity rate (-1.54 μGal yr -1 ) is probably due to the hydrological gravity effect, because seasonal hydrological gravity effects may influence gravity rate estimations (Van Camp et al 2010, 2016. After removing the hydrological effect using Eq.…”

Section: Gravity Changes Due To Moho Deepening and Plate Subductionmentioning

confidence: 99%

Absolute gravity change in Taiwan: Present result of geodynamic process investigation

Kao¹,

Hwang²,

Kim³

et al. 2017

Terr. Atmos. Ocean. Sci.

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Gravity values at 24 sites over 2004 -2016 measured with absolute gravimeters are used to study geodynamic processes in Taiwan. We model rain-induced gravity effects and other temporal effects of non-geodynamic origins to obtain residual gravity, which cannot be fully explained by GPS-derived vertical displacements. We explain the gravity changes associated with deposited debris, earthquake, volcanism and Moho deepening. Gravity changes of 53.37 and 23.38 μGal near Sinwulyu and Laonong Rivers are caused by typhoon Morakot, leading to estimated volumes of 6.0 × 10 5 and 3.6 × 10 5 m 3 in deposited debris. The observed co-seismic gravity change near the epicenter of the M 6.9 Pingtung earthquake (26 December 2006) is 3.12 ± 0.99 μGal, consistent with a dislocation-based gravity change at the μGal level, thereby supplying a gravity constraint on the modeled fault parameters. The AG record at the Tatun Volcano Group is the longest, but large temporal gravity effects here has led to a current gravity signal-to-noise ratio of less than one, which cannot convince a sinking magma chamber, but supply an error bound for gravity detections of long-term or transient magma movements. The gravity values at Ludao and Lanyu decline steadily at the rates of -2.20 and -0.50 μGal yr -1 , consistent with the expected magma states of the two extinct volcanoes. The gravity rates at an uplifting site in central Taiwan and three subsiding sites in eastern Taiwan are negative, and are potentially caused by Moho deepening at a rate of -3.34 cm yr -1 and a combined Moho deepening and plate subduction at the rates of -0.18, -2.03, and -1.34 cm yr -1 . Article history:Received 10

show abstract

Evidence for a magma reservoir beneath the Taipei metropolis of Taiwan from both S-wave shadows and P-wave delays

Cited by 48 publications

References 20 publications

Seismic Stratigraphic Features of the Late Miocene-Present Unconformities and Related Seismic Units, Northern Offshore Taiwan

Seismic Stratigraphic Features of the Late Miocene-Present Unconformities and Related Seismic Units, Northern Offshore Taiwan

Holocene eruptions of Mt. Popa, Myanmar: Volcanological evidence of the ongoing subduction of Indian Plate along Arakan Trench

Absolute gravity change in Taiwan: Present result of geodynamic process investigation

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