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  • Seismological Society of America (SSA)  (3)
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  • Seismological Society of America (SSA)  (3)
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  • 1
    Online Resource
    Online Resource
    A Temporary Broadband Seismic Array in the Largest Desert of China: TASTE
    Seismological Society of America (SSA) ; 2023
    In:  Seismological Research Letters Vol. 94, No. 1 ( 2023-01-01), p. 281-293
    Details
    In: Seismological Research Letters, Seismological Society of America (SSA), Vol. 94, No. 1 ( 2023-01-01), p. 281-293
    Abstract: In early Permian, a mantle plume heated up the Tarim block and formed the Tarim large igneous province. It is an interesting phenomenon to explore the interaction between mantle plume and a thick continent lithosphere, because mantle plume has been proposed to be an important route of material and energy transportation in the earth. Currently, the Tarim block is surrounded by Tibetan plateau to its south edge and Tian Shan orogeny to its north edge. The combined effects of both mantle plume activity and plate tectonics should have significantly changed the structure and composition of the Tarim block because of its amalgamations in Neoproterozoic. Seismic imaging plays a key role on revealing the deep structure of the Earth, which could help unravel the questions mentioned before. However, the harsh natural environment in the central part of the Tarim basin, the Taklimakan desert—the largest desert in China—has seriously hampered the broadband seismological observation. From July 2017 to November 2019, the Institute of Geology and Geophysics, Chinese Academy of Sciences deployed a 2D broadband seismic array named the Tarim seismic Array for lithoSpheric signaTure of mantle plumE (TASTE) over the inner part of the Tarim basin with an averaged spacing of 60–70 km. The primary target of this project is to obtain a detailed lithospheric structure to resolve the possible lithospheric signatures of Permian mantle plume activity. Here we introduce the basic information of the TASTE network and the performance of these instruments by analyzing the background noise level. Preliminary results of receiver function and ambient noise analyses are also shown, which may suggest a thick sedimentary layer, as well as complicated crust and lithospheric feature.
    Type of Medium: Online Resource
    ISSN: 0895-0695 , 1938-2057
    URL: Article
    DOI: 10.1785/0220220056
    Language: English
    Publisher: Seismological Society of America (SSA)
    Publication Date: 2023
    detail.hit.zdb_id: 2403376-5
    detail.hit.zdb_id: 1147385-X
    SSG: 16,13
    Location Call Number Limitation Availability
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Seismic Monitoring of Super High-Rise Building Using Ambient Noise with Dense Seismic Array
    Seismological Society of America (SSA) ; 2021
    In:  Seismological Research Letters Vol. 92, No. 1 ( 2021-01-01), p. 396-407
    Details
    In: Seismological Research Letters, Seismological Society of America (SSA), Vol. 92, No. 1 ( 2021-01-01), p. 396-407
    Abstract: We report the first thorough seismological study of the Shanghai Tower, the second tallest building in the world, by applying seismic interferometry to ambient noise recorded by a dense seismic array. We extract the building responses by deconvolution of the seismic vibrations for three components of the impulse response functions (IRFs), and retrieve two wave types corresponding to vertical and horizontal wave components that travel along the core tube of the tower. Five new resonant modes are identified here for the first time between 1 and 5 Hz. Displacements for the resonant modes around 1 Hz are strongly attenuated by the passive damper system installed on the top floor of the building. Refuge floors connected to the outrigger trusses system have unique structural properties, characterized by a specific resonant mode, which apparently shifts from 1.8 Hz at the base of the building, to ∼3  Hz at the top. The most interesting observation is the diurnal variation in both the seismic velocities and the mechanical response of the building, which correlates with temperature, and was detected by repeated measurement of coda waves for the IRFs and the horizontal-to-vertical spectral ratio. Seismic velocity appears to increase for the structure at midnight due to cooling that drives an increase in rigidity, which reaches a local maximum in the early morning and decreases after sunrise. In summary, our study demonstrates the effective application of seismic ambient-noise interferometry for structural health monitoring and for hazard assessment for super high-rise buildings worldwide.
    Type of Medium: Online Resource
    ISSN: 0895-0695 , 1938-2057
    URL: Article
    DOI: 10.1785/0220200119
    Language: English
    Publisher: Seismological Society of America (SSA)
    Publication Date: 2021
    detail.hit.zdb_id: 2403376-5
    detail.hit.zdb_id: 1147385-X
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    Fluids Triggered the 2021 Mw 6.1 Yangbi Earthquake at an Unmapped Fault: Implications for the Tectonics at the Northern End of the Red River Fault
    Seismological Society of America (SSA) ; 2022
    In:  Seismological Research Letters Vol. 93, No. 2A ( 2022-03-01), p. 666-679
    Details
    In: Seismological Research Letters, Seismological Society of America (SSA), Vol. 93, No. 2A ( 2022-03-01), p. 666-679
    Abstract: On 21 May 2021 a magnitude Mw 6.1 earthquake occurred in Yangbi region, Yunan, China, which was widely felt and caused heavy casualties. Imaging of the source region was conducted using our improved double-difference tomography method on the huge data set recorded by 107 temporary stations of ChinArray-I and 62 permanent stations. Pronounced structural heterogeneities across the rupture source region are discovered and locations of the hypocenters of the Yangbi earthquake sequence are significantly improved as the output of the inversion. The relocated Yangbi earthquake sequence is distributed at an unmapped fault that is almost parallel and adjacent (∼15 km distance) to the Tongdian–Weishan fault (TWF) at the northern end of the Red River fault zone. Our high-resolution 3D velocity models show significant high-velocity and low-VP/VS ratios in the upper crust of the rupture zone, suggesting the existence of an asperity for the event. More importantly, low-VS and high-VP/VS anomalies below 10 km depth are imaged underlying the source region, indicating the existence of fluids and potential melts at those depths. Upward migration of the fluids and potential melts into the rupture zone could have weakened the locked asperity and triggered the occurrence of the Yangbi earthquake. The triggering effect by upflow fluids could explain why the Yangbi earthquake did not occur at the adjacent TWF where a high-stress accumulation was expected. We speculate that the fluids and potential melts in the mid-to-lower crust might have originated either from crustal channel flow from the southeast Tibet or from local upwelling related to subduction of the Indian slab to the west.
    Type of Medium: Online Resource
    ISSN: 0895-0695 , 1938-2057
    URL: Article
    DOI: 10.1785/0220210227
    Language: English
    Publisher: Seismological Society of America (SSA)
    Publication Date: 2022
    detail.hit.zdb_id: 2403376-5
    detail.hit.zdb_id: 1147385-X
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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