[보고서]다중모드 알고리즘을 이용한 한반도 일대의 3차원 속도구조 연구

조봉곤

보고서 정보

주관연구기관

전북대학교
Chonbuk National University

연구책임자

조봉곤

참여연구자

이우동 , Gyanendra Gurung , Bad Javzandolgor , 김주완 , 정샛별

보고서유형

3단계보고서

발행국가

대한민국

언어

한국어

발행년월

2012-03

과제시작연도

2011

주관부처

기상청

과제관리전문기관

기상지진기술개발사업단

등록번호

TRKO201200001113

과제고유번호

1365001315

DB 구축일자

2013-04-18

키워드

다중모드 알고리즘,합성지진파,3차원 구조,토모그래피multimode algorithm,synthetic seismogram,3D structure,tomography

표 Plan for preparing full, state-of-the-art model for the extended Himalaya
표 Relatively simple surface geology used in forming the 3-D map for the preliminary structure–hat beneath the blue-outlined region in fig. 3.2.1
표 Structural model directly beneath Location 21.
표 The transverse-wave and compressional-wave velocity for (a) central structure at Location 21, and for (b) laterally-averaged, laterally-homogeneous (and vertically-heterogeneous) structure for each surface sensing-circle diameter at Location 21.
표 For Location 21, in Panel (a) are weighted, azimuthally-averaged radii ∥ and ⊥, and in Panel (b) are the resulting, effective radii of surface curvature  .
표 For Location 21, comparison of the physical phase velocities ( ) computed by the static-computation procedure, for the two different structures: central structure 21, and the corresponding true structure.
표 For Location 21, comparison of the physical phase attenuations ( ) computed by the static-computation procedure, for the two different structures: central structure 21, and the corresponding true structure.
표 Summary of possible improvements in A1(z) and B1(z), from the initial, central structure 21 approximation with true R.
표 Summary of possible improvements in A2(z) and B2(z), from the initial, central structure 21 approximation with true R.
표 For specific source depth h, Panels (a) and (b) show the responses of the structure for a strike-slip on a vertical fault plane, representing shallow sources. Panel (c) and Panel (d) are responses to a dip-slip on a fault plane dipping 45° below the horizontal for deeper sources. For additional clarity, modes are tagged by their modal numbers wherever appropriate.
표 For Location 21, comparison of the physical phase velocities ( ) computed by the static-computation procedure, for true structures: one with a constant radius of curvature of 6371 km and the other true structure with variable surface curvature.
표 For Location 21, comparison of the physical phase velocities ( ) computed by the static-computation procedure, for true structures: one with a constant radius of curvature of 6371 km and the other true structure with variable surface curvature.
표 Summary of possible improvements in A1(z) and B1(z), from an initial,true 3-D structure with constant R = 6371 km.
표 Summary of possible improvements in A2(z) and B2(z), from an initial, true3-D structure with constant R = 6371 km.
표 Physical phase velocities ( ) at Location 21 ( = 0°, where  is the surface azimuthal angle from north) for propagating torsional and spheroidal modes for depth of penetration less than 800 km. Several distinct stationary phases can be observed at 4.5 km/sec, 5.0 km/sec, and 6.1 km/sec that are associated with energy being trapped within certain structural depths. Torsional Mode 1 is the Love wave and spheroidal Mode 1 is the Rayleigh wave.
표 Attenuation parameter (1/) at Location 21 ( = 0°) for propagating torsional and spheroidal modes for depth of penetration less than 800 km. The frequency ranges where Mode 2 and Mode 3 curves have a somewhat constant 1/  represent increased attenuation, and these frequency ranges for these two modes are associated with the trapping of the modal energy within the low velocity zone (LVZ). For both the torsional and spheroidal cases, at a frequency of about 0.07 Hz decreasing 1/ of Mode 2 crosses increasing 1/ of Mode 3 as Mode 2 exits, and Mode 3 enters the LVZ.
표 Approximate group velocities at Location 21 ( = 0°) of propagating torsional and spheroidal modes for depth of penetration less than 800 km. The maxima and minima of the modes are stationary phases that are associated with modal energy being trapped at certain structural depths. Within the respective frequency ranges of 0.03 - 0.07 Hz and 0.075 - 0.10 Hz, Modes 2 and Modes 3 have distinct stationary phases between 3.9 km/sec to 4.6 km/sec which are the Sa stationary phases; when Modes 2 exit the LVZ, they become crustal modes Lg.
표 Energy-density integrals I at Location 21 ( = 0°) for propagating torsional and spheroidal modes for depth of penetration less than 800 km.
표 Effective radii of curvature R at locations 1010, 1011, ..., and 1020, which are locations lying along an alignment that is perpendicular to the major Himalayan axis in the eastern part of the study area.
표 Effective radii of curvature R at Location 21 ( = 0°) for propagating torsional and spheroidal modes for depth of penetration less than 800 km.
표 Surface sensing-circle diameters S at Location 21 ( = 0°) for propagating torsional and spheroidal modes for depth of penetration less than 800 km. These diameters satisfy the current form of our “fundamental assumption” which states that S is equal to 1.5 times the depth of penetration D.
표 Depth of penetration D at Location 21 ( = 0°) for propagating torsional and spheroidal modes for depth of penetration less than 800 km. These depths represent the minimum values for each (mode, frequency) pair, above which 99.99 % of the modal energy is concentrated. This is equivalent to the energy-density integral being accurate to 5 sig. fig.
$Summary of estimated \best$ 표 Summary of estimated \best" values of K
표 the dashed line represents the sloping Mohomodel that was used by Boore (1970b), the dotted line represents the single-step Moho, and the staircase is our current “M Discontinuity Step” approximation.
표 In the upper panels, the red curves are Boore’ (1970b) “transmission factors”at the indicated distances from x = 0; in our analysis, the dashed portions of the curves have been neglected.
표 Transmission factors for real formulation for 1-scatterer model.
표 Transmission factors for real formulation for 13-scatterer model.
표 Transmission factors for complex formulation for 13-scatterer model.
표 Theoretical seismograms for downdip propagation for propagating SH modes using both real and complex formulation.
표 Theoretical seismograms for updip propagation for propagating SH modes using both real and complex formulation. For both real and complex formulation, K = 1.00.
표 Top left-hand panel shows that contributions from the torsional modes are dominant in the azimuthal-component seismograms   , and the spheroidal modes are subordinate (top-right panel). In the polar-component seismograms   , the spheroidal modes are dominant (bottom-right panel) and torsional modes are subordinate (bottom-left panel). These seismograms are for frequency range of 0.005 Hz and 0.09 Hz. The epicentral distances s are given on the far right of each seismogram.
표 Top panel represents the azimuthal-component seismograms    at s = 10, 20, 30, 50, 70, and 90 km and the bottom panel for s =800, 1000, 1200, ..., 2000 km. The seismograms on the left represent the dominant torsional modes contributions, and the subordinate spheroidal modes contributions are on the right. These seismograms are for frequency range of 0.005 Hz and 0.09 Hz. The epicentral distances s are given on the far right of each seismogram.
표 Top panel represents the polar-component seismograms    at s = 10, 20, 30, 50, 70, and 90 km and the bottom panel for s = 800, 1000, 1200, ..., 2000 km. The seismograms on the left represent the subordiante torsional modes contributions, and the dominant spheroidal modes contributions are on the right. However, it should be noted that the torsional modes contributions become subordinate only for station-event distance s > 50 km. These seismograms are for frequency range of 0.005 Hz and 0.09 Hz. The epicentral distances s are given on the far right of each seismogram.
표 Map showing the Korean peninsula and surrounding regions. Major ridges and basins are presented with topographic map
표 Distribution of magnitude. (b) Distribution of epicentral distance.
표 Map showing earthquake and station pairs for determination of velocity structure. Location of earthquakes are denoted by red circles and stations of KMA, NEID and IRIS are denoted by orange triangles.
표 An example of determination of Rayleigh wave group velocity using the wavelet transformation. (a) BAR stations’ seismogram of an earthquake occurred near east coast of Honshu, Japan on 15 Feb. 2009. The epicentral distance is 1533 km. (b) Group velocity energy diagram of Rayleigh waves. Locations showing the maximum energy concentration for each period are denoted by black circles and determined group velocity dispersion curve is presented in a green line.
표 Calculated Rayleigh wave group velocity dispersion curves and number of velocities according to period change; (a) and (c) for the East sea, (b) and (d) for the Yellow sea.
표 Checkerboard test map and cell hits map.
표 Group velocity distribution maps for 14, 25, 50 and 80 s.
표 Shear wave velocity maps for 10, 25, 50 and 80 km.
표 Vertical shear wave velocity sections.
표 Mohorovichicic discontinuity distribution map.
표 구축된 병렬처리시스템 제원표
표 Station information of KMA
표 Station information of IRIS
표 Station information of F-NET
표 Event information use this study

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[국가R&D연구보고서] 다중모드 알고리즘을 이용한 한반도 일대의 3차원 속도구조 연구 A study on the 3D velocity structure using multi-mode computation algorithm in and around the Korean Peninsula 원문보기

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A study on the 3D velocity structure using multi-mode computation algorithm in and around the Korean Peninsula 원문보기

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