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Coherency Characteristics of Body Waves Traveling in a Sedimentary Layer–Basement System in the Kanto Region, Japan

¹ Yokohama City University
22-2 Seto, Kanazawa-ku
Yokohama, Japan 236-0027
kkk001{at}yokohama-cu.ac.jp
 (S.K.)

² Mitutoyo Co.
20-1, Sakado 1-chome, Takatsu-ku
Kawasaki-shi, Japan 213-8533
 (M.O.)

View larger version (21K): [in a new window]   Figure 1. The six borehole stations, ENZ, FCH, IWT, SHM, NRT, and EDZ, that are arranged from west to east across the central Kanto region, on a sedimentary layer–basement system.

View larger version (28K): [in a new window]   Figure 2. (a) Locations of two deep-borehole sites, SHM and FCH. The borehole array recordings from these sites are used for investigating the coherency characteristics of P waves. The data from events whose locations are shown by open triangles and open circles are used for stations SHM and FCH, respectively. (b) Locations of six borehole sites, SHM, FCH, IWT, EDZ, NRT, and ENZ. The borehole array recordings from these sites are used for investigating the coherency characteristics of SH waves. The data from events whose locations are shown by open triangles, open circles, open squares, open reverse triangles, open rhombuses, and solid circles are used for stations SHM, FCH, IWT, EDZ, NRT, and ENZ, respectively.

View larger version (32K): [in a new window]   Figure 3. SH component array seismograms recorded at the SHM site for the event of 1 January 1988.

View larger version (58K): [in a new window]   Figure 4. (a) Coherence estimated by using a direct SH phase and its surface reflection recorded at deep borehole. (b) Coherence estimated by using two direct SH waves recorded at deep borehole and surface (solid circles). Dotted lines indicate 95% confidence level of regression analysis.

View larger version (42K): [in a new window]   Figure 5. Coherences estimated from events recorded at stations (a) SHM and (b) FCH for P waves (solid circles). Dotted lines indicate 95% confidence level of regression analysis.

View larger version (14K): [in a new window]   Figure 6. Coherences estimated from events recorded at stations (a) SHM and (b) FCH for P waves (solid circles). Dotted lines indicate 95% confidence level of regression analysis.

View larger version (18K): [in a new window]   Figure 7. Coherences estimated from events recorded at stations (a) SHM and (b) FCH for SH waves (solid circles). Dotted lines indicate 95% confidence level of regression analysis.

View larger version (47K): [in a new window]   Figure 8. Coherences estimated from events recorded at stations (a) SHM, (b) FCH, (c) IWT, (d) NRT, (e) ENZ, and (f) EDZ for SH waves (solid circles). Dotted lines indicate 95% confidence level of regression analysis.

View larger version (10K): [in a new window]   Figure 9. Estimates of fc/2 for coherence model and standard error bars: (a) n = 2 and (b) n is free.

View larger version (11K): [in a new window]   Figure 10. Estimates of for coherence model and standard error bars: (a) n = 2 and (b) n is free.