Attenuation of Coda Waves at the Changbaishan Tianchi Volcanic Area in Northeast China

Wu, Jianping; Jiao, Wenjie; Ming, Yue-Hong; Su, Wei

doi:10.1007/s00024-006-0076-4

Cited by 14 publications

(12 citation statements)

References 12 publications

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“…Attenuation study shows that Q c value is lower near the central area of the volcano, and relatively higher in the outskirts in Changbaishan (Wu et al, 2006). Considering the presence of high conductive bodies beneath the area from MT investigation (Tang et al, 2001), surface horizontal expansion and vertical uplifting from GPS measurement and leveling (Cui et al, 2007), and high seismicity centered at the caldera during 2002−2005 (Wu et al, 2005Ming et al, 2006Ming et al, , 2007, we consider that the low velocity layer near the caldera is caused by the high temperature medium related to the magma chambers.…”

Section: Discussionmentioning

confidence: 97%

S-wave velocity structure beneath Changbaishan volcano inferred from receiver function

Ming

Fang

et al. 2009

Earthq Sci

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The S wave velocity structure in Changbaishan volcanic region was obtained from teleseismic receiver function modeling. The results show that there exist distinct low velocity layers in crust in volcano area. Beneath WQD station near to the Tianchi caldera the low velocity layer at 8 km depth is 20 km thick with the lowest S-wave velocity about 2.2 km/s. At EDO station located 50 km north of Tianchi caldera, no obvious crustal low velocity layer is detected. In the volcanic region, the thickness of crustal low velocity layer is greater and the lowest velocity is more obvious with the distance shorter to the caldera. It indicates the existence of the high temperature material or magma reservoir in crust near the Tianchi caldera. The receiver functions and inversion result from different back azimuths at CBS permanent seismic station show that the thickness of near surface low velocity layer and Moho depth change with directions. The near surface low velocity layer is obviously thicker in south direction. The Moho depth shows slight uplifting in the direction of the caldera located. We consider that the special near surface velocity structure is the main cause of relatively lower prominent frequency of volcanic earthquake waveforms recorded by CBS station. The slight uplifting of Moho beneath Tianchi caldera indicates there is a material exchanging channel between upper mantle and magma reservoir in crust.

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Section: Discussionmentioning

confidence: 97%

S-wave velocity structure beneath Changbaishan volcano inferred from receiver function

Ming

Fang

et al. 2009

Earthq Sci

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“…6d). The zone is about 2. , receiver function and seismic coda Q inversion [6,7] indicated that a magma system might exist near the Changbaishan Tianchi caldera. Two highprecision relative location results revealed that the earthquakes occurred only in a very narrow fracture zone, and the rupture surface inclined to the outside of the magma body.…”

Section: Analysis Of Earthquake Swarm Processmentioning

confidence: 99%

Earthquake Swarm Activity in Changbaishan Tianchi Volcano

Ming

Zhang

et al. 2007

Chinese J of Geophysics

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In summers of 2002 and 2003, temporary seismic stations had recorded a large number of small earthquakes and a series of swarms near Changbaishan Tianchi volcano. Earthquake location result shows that these earthquakes mainly occurred near the Tianchi caldera. Almost all swarms were concentrated at southwest of the caldera, and no swarms occurred in northeast area where earthquakes densely concentrated. In other seasons, the permanent station CBS is the only seismic station to monitor volcanic earthquakes in Tianchi volcano. Waveform correlation analysis of seismic data recorded at CBS in different time shows that earthquake swarms occurred in other seasons also concentrated in the southwest Tianchi Lake. High‐precision relative location shows that hypocenters of earthquake swarm distributed along northwest with a dip angle of 80° to southwest. During the July 13, 2003 earthquake swarm the hypocenters migrated from deep to shallow and deeper events had upward first motion directions almost at all stations. That means they had obvious expansion component in source mechanism. Taking into account of significant surface deformation in Changbaishan Tianchi volcano since 2002, geochemical anomalies and harmonic‐spectral earthquakes, we believe that the earthquake swarm activity was caused by magmatic and hydrothermal activity and pressure increase of magma near the depth of 5km.

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“…However, other geophysical studies do not support the existence of the low-velocity structure [Zhang et al, 2002;Choi et al, 2013], while at the same time they point to the presence of structures with low density and low V P only beneath the MBV. In contrast, it is well documented that a shallow magmatic structure exists near the summit of the MBV (< 5 km), which is thought to have caused earthquake Journal of Geophysical Research: Solid Earth 10.1002/2017JB014105 swarms, surface deformation, high seismic attenuation, and low electric resistivity at shallow depths [e.g., Tang et al, 2001;Wu et al, 2006;Xu et al, 2012].…”

Section: Introductionmentioning

confidence: 99%

Seismic constraints on magma evolution beneath Mount Baekdu (Changbai) volcano from transdimensional Bayesian inversion of ambient noise data

2017

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The magmatic process of continental intraplate volcanism (CIV) is difficult to understand due to heterogeneous interactions with the crust and the lithospheric upper mantle. Mount Baekdu (Changbai) volcano (MBV) is one of the prominent CIVs in northeast Asia that has shown a complex history of eruptions and associated magmatic structures. In addition, the relationship between the crustal magmatic structures and upper mantle phenomena are enigmatic due to the lack of consistent seismic constraints for the lithospheric structure. To enhance comprehensive understanding of the MBV magma evolution, we image the lithospheric structure beneath the MBV and surrounding regions using ambient noise data and the following two approaches: (1) multiple measures of ambient noise dispersion are acquired through different methods and (2) a transdimensional Bayesian inversion method is utilized to obtain unbiased results in joint analysis of the multiple data sets. The estimated Earth structure shows a thick crust (~40 km) and a crustal anomaly with relatively high S wave velocity in the depth range 20–40 km. This type of structure extends to ~100 km north from the MBV and is accompanied by the shallow and rapid S wave velocity decrease beneath the mantle lid (~80 km). Through a comparison with previous P wave models, we interpret this structure as a consequence of compositional partitioning by mafic underplating and overlying cooled felsic layers as a result of fractional crystalization.

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Attenuation of Coda Waves at the Changbaishan Tianchi Volcanic Area in Northeast China

Cited by 14 publications

References 12 publications

S-wave velocity structure beneath Changbaishan volcano inferred from receiver function

S-wave velocity structure beneath Changbaishan volcano inferred from receiver function

Earthquake Swarm Activity in Changbaishan Tianchi Volcano

Seismic constraints on magma evolution beneath Mount Baekdu (Changbai) volcano from transdimensional Bayesian inversion of ambient noise data

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