Attenuation of P and S waves in the Oaxaca, Mexico, subduction zone

Lateral variation of Lg wave propagation in southern Mexico

“…They obtained a frequency-dependent quality factor, Q( f ) = 273 f 0.66 , which may be taken as a reference value for southern Mexico. Castro and Munguía [1993] found a lower quality factor for S waves above the Oaxaca subduction zone. Castro et al [1994] compared results for Q from Oaxaca and Guerrero and attempted to explain the unexpected lower Q in the Oaxaca region.…”

“…Previous studies for Guerrero [Castro et al, 1990;Ordaz and Singh, 1992] are representatives of the Guerrero terrane, and give similar results to ours. The study by Castro and Munguía [1993] for Oaxaca gives smaller Q values for the area 97.2°to 96.3°W and 15.5°to 16.2°N. Low Q values for this region may not be representative for the entire Mixteco-Oaxaca terrane.…”

“…Shin and Herrmann [1987] reported that the observed geometrical spreading of Lg waves in the time domain, R À0.83 , is equivalent to R À0.5 in the frequency domain. Taking the logarithm of (1) for distances larger than R x gives (a) Area 1 studied by Castro and Munguía [1993], area 2 studied by Castro et al [1990] and Ordaz and Singh [1992], and area 3 studied by Cárdenas et al [1998]; (b) Guerrero (denoted by G) and Oaxaca (denoted by O) sectors studied by Domínguez et al [1997]; and (c) Michoacan-Jalisco (M), Guerrero (G) and Oaxaca (O) sectors as defined by Yamamoto et al [1997].…”

Coda Q estimates in the Hong Kong Region

“…Central United States (Singh and Herrmann, 1983) 1000 a 0.2 CENA (except New Brunwick) (Hasegawa, 1985) 900 0.2 Quebec (CENA) (Boore and Atkinson, 1998) 755 0.5 Eastern North America (Atkinson and Boore, 1995) 680 0.36 Southeastern Canada (CENA) (Atkinson and Mereu, 1992) 670 0.33 South China Region (Chen and Nuttli, 1984) 592 N/A Indian shield region (Singh et al, 1999) 508 0.48 New Brunswick (CENA) (Shin and Herrmann, 1987) 500 0.65 Guangdong province, China (Wong et al, 2002) 482 0.31 Norwegian continental shelf (Bungum et al, 1992) 465 0.64 New England (Pulli, 1984) 460 a 0.4 Central Europe (Malagnini et al, 2000b) 400 0.42 Haifeng, Guangdong, China (Jin and Aki, 1988) 370 a 0.4 Beijing, China (Zhang et al, 1998) 342 a 0.74 Xingfenziang, Guangdong, China (Jin and Aki, 1988) 240 a 0.3 Central Mississippi Valley (CENA) (Dwyer et al, 1984) 210 a 0.78 California (WNA) (Atkinson and Silva, 1997) 204 0.56 Southern Iberia (Canas et al, 1991) 100-200 a 0.6-0.73 Western United States (Singh and Herrmann, 1983) 150 a 0.45 West America (Chin and Aki, 1991) 150 0.5 Northridge, California (Beresnev and Atkinson, 1998) 150 0.5 Apenninesm Italy (Malagnini et al, 2000a) 130 0.1 Southwestern British Columbia, Canada (Zelt et al, 1999) 110 a 0.72 Trinidad and Tobago, West Indies (Latchman et al, 1996) 107-132 a 0.8-1.06 Ningxia, China (Zhao et al, 2000) 104 a 0.83 Victoria, Australia (Wilkie and Gibson, 1995) 100 a 0.85 Garibbran, West Indies (Ambeh and Lynch, 1993) 97-145 a 1.09-0.82 Koyna, India (Gupta et al, 1998) 9 6 a 1.09 Luanxian, Hebei, China (Li et al, 1990) 4 6 -7 2 a 0.85-0.9 Washington State, USA (Havskov et al, 1989) 6 3 a 0.97 Oaxaca, Mexico (Castro and Munguia, 1993) 56 1.01 Northeastern Japan (average value) (Matsumoto and Hasegawa, 1989)…”

Attenuation of S wave in the crust of Ordos massif

“…We can also see from Figure (Castro and Munguia, 1993); 5. Western US Q(f)=150f °5 (Chin and Aki, 1991); 6.…”