Deep geophysical anomalies beneath the Changbaishan Volcano

Li, Shaohua; Li, Jiaqi; Ferrand, Thomas P.; Zhou, Tong; Lv, Mingda; Xi, Ziyi; Maguire, Ross; Han, Guilai; Li, Juan; Bao, Xiyuan; Jiang, Yiran; Bao, Tiezhao

doi:10.1002/essoar.10512466.1

Cited by 3 publications

(3 citation statements)

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“…Seismic stations used in this study are described in Zheng et al. (2010), https://doi.org/10.1785/0120090257, and the waveform data are freely accessible in the Zenodo repository (https://doi.org/10.5281/zenodo.7102579) (Li, Li, et al., 2022).…”

Section: Data Availability Statementmentioning

confidence: 99%

Deep Geophysical Anomalies Beneath the Changbaishan Volcano

Ferrand

et al. 2023

JGR Solid Earth

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Subsurface imaging is key to understanding the origin of intraplate volcanoes. The Changbaishan volcano, located about 2,000 km away from the western Pacific subduction zone, has several debated origins. To investigate this, we compared regional seismic tomography with the electrical resistivity results and obtained high‐resolution 1D and quasi‐2D velocity‐depth profiles. We show that the upper mantle is characterized by two anomalies exhibiting distinct features which cannot be explained by the same mechanism. We document a localized low‐velocity anomaly atop the 410‐km discontinuity, where the P‐wave velocity is reduced more than that of the S‐wave (i.e., lower Vp/Vs). We propose that this anomaly is caused by the reduction of the effective moduli during the phase transformation of olivine. The other anomaly, located between 300 and 370 km depth, reveals a significant reduction of the S‐wave velocity (i.e., higher Vp/Vs), associated with a reduction of the electrical resistivity, altogether consistent with partial melting.

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Section: Data Availability Statementmentioning

confidence: 99%

Deep Geophysical Anomalies Beneath the Changbaishan Volcano

Ferrand

et al. 2023

JGR Solid Earth

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“…In contrast, V s is mostly affected by the fluid phase or partial melts. Therefore, a large amount of partial melts and high‐temperature zones in the magma chamber would significantly influence the shear strength of surrounding rocks but affect the compressive strength modestly due to the hydration of crystal lattices or grain boundaries (Kasatkina et al., 2014; Koulakov et al., 2021; Li et al., 2023; Toomey et al., 1998). In addition, the high‐ V p anomaly might indicate that the magma chamber has been partially crystallized, which is similar to a high‐velocity layer revealed beneath the Datong volcano (He et al., 2021).…”

Section: Resultsmentioning

confidence: 99%

Seismicity and Magmatic System of the Changbaishan Intraplate Volcano in East Asia

Yan,

Tian,

Zhao

et al. 2023

JGR Solid Earth

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A high‐precision earthquake catalog is made from continuous waveform data recorded at 360 portable seismographs deployed for one month in the Changbaishan‐Tianchi volcanic area based on an automatic earthquake detection and location workflow. Then we investigate detailed 3‐D structures of P and S wave velocities (Vp and Vs) and Vp/Vs ratio of the crust beneath the study region. Our results reveal a high‐Vp/Vs zone accompanied with active volcanic earthquakes beneath the Tianchi caldera at ∼5 km depth, which may reflect a magma chamber. The intense seismic activities within 2 km depth beneath the Tianchi caldera from 2002 to 2005 occurred directly above the magma chamber revealed by this study, which could be related to upward migration of high‐pressure volatiles originating from the magma chamber. A potential middle‐crustal magma chamber might provide continuous magmatic materials feeding the upper‐crust magma chamber and lead to ruptures of surrounding rocks, resulting in two swarms of volcanic seismicity during the observation period. We deem that the diverse eruption styles of the Changbaishan volcano are closely associated with the multilevel structure of magma chambers in the upper and middle crust.

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“…The LVLs are characterised by thicknesses of 56-94 km and P-wave velocity drops of −2.8 to −4.7%. This cannot be explained by the phase transition of serpentine into dense hydrous magnesium silicate 35 , nor can it be explained by the phase transformation of olivine 36 . Similar LVLs are found worldwide [5][6][7][8][9][10][11][12][13][14][15] , and these results are usually explained as being caused by partial melting induced by water and/or other volatiles (i.e.…”

Section: Discussionmentioning

confidence: 98%

Upper mantle melt caused by a subducted slab in the Indian-Eurasian continental subduction zone

Li,

Zhou,

Bai

et al. 2023

Commun Earth Environ

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A low-velocity layer atop the mantle transition zone has been extensively observed worldwide. In subduction zones, this layer is widely explained as partial melting triggered by slab subduction on a regional or global scale. However, direct observational evidence is still absent, and the response of the layer to slab subduction is not well known. Here, we image the seismic velocity around the mantle transition zone by matching synthetic and observed triplicated seismic P and sP waveforms in the Indian–Eurasian continental subduction zone. Our observations reveal a laterally varied low-velocity layer atop the mantle transition zone beneath the Hindu Kush, where a subducted slab extends to the mantle transition zone. The geometric morphology of the low-velocity layer documents that it is a partially molten layer induced by the subducted slab on a regional scale. Interestingly, our observations also support that the layer has a low viscosity. The decreased viscosity may facilitate slab motion in the deep mantle, contributing to slab stretching, tearing and break-off and its resultant rare recurring large intermediate-depth earthquakes in an intracontinental setting.

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Deep geophysical anomalies beneath the Changbaishan Volcano

Cited by 3 publications

References 50 publications

Deep Geophysical Anomalies Beneath the Changbaishan Volcano

Deep Geophysical Anomalies Beneath the Changbaishan Volcano

Seismicity and Magmatic System of the Changbaishan Intraplate Volcano in East Asia

Upper mantle melt caused by a subducted slab in the Indian-Eurasian continental subduction zone

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