Centroid-moment tensor solutions for January–March 1988

Centroid-moment tensor solutions for January–March 1988

22 Physics of the Earth and Planetary Interiors, 54 (1989) 22—32 Elsevier Science Publishers By., Amsterdam — Printed in The Netherlands Letter S...

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22

Physics of the Earth and Planetary Interiors, 54 (1989) 22—32

Elsevier Science Publishers By., Amsterdam



Printed in The Netherlands

Letter Section

Centroid-moment tensor solutions for January—March 1988 A.M. Dziewonski, G. Ekström

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J.H. Woodhouse and G. Zwart

Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138 (U.S.A.)

(Received August 12, 1988; accepted August 16, 1988)

Dziewonski, A.M., Ekström, G., Woodhouse, J.H. and Zwart, G., 1989. Centroid-moment tensor solutions for January—March 1988. Phys. Earth Planet. Inter., 54: 22—32. Centroid-moment tensor solutions are presented for 201 earthquakes that occurred during the first quarter of 1988. The solutions are obtained using corrections for aspherical Earth structure.

This is the first quarterly report on the global seismicity of 1987 as investigated using the centroid-moment tensor technique. The data for the years 1982, 1983, 1984, 1985, 1986 and 1987 have been published by Dziewonski et al. (1983a—c, 1984a—c, 1985a—d, 1986a—c, 1987a—d, 1988a—c, 1989). The CMT method is described in detail by Dziewonski et al. (1981), with the later enhancements (incorporation of mantle wave data) given by Dziewonski and Woodhouse (1983) and Woodhouse and Dziewonski (1984). The 1983 paper is the first example of the application of the CMT method to study systematically global

*

Present address: Lamont-Doherty Geological Observatory, Palisades, NY, U.S.A.

0031-9201/89/$03.50

© 1989 Elsevier Science Publishers B.V.

seismicity; it contains solutions for 201 events that occurred during 1981. The CMT method has been further refined by Woodhouse and Dziewonski (1984) by the introduction of corrections for the aspherical Earth structure. A brief description of this development is presented in the report for the first quarter of 1984 (Dziewonski et a!., 1984c). The present format of publication of CMT results is fully described by Dziewonski et a!. (1987a). The contents and format of Tables I and II and Fig. 1, which contain data for January, February and March of 1988, have been explained by Dziewonski et al. (1987a) and we refer the reader to that paper.

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29

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28

~

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Fig. 1. Equal area projection

~

~

of the geometrical representation of the moment tensor solution of the earthquakes listed in Table I.

Solid lines are the projections of the nodal surfaces for the full moment tensor solution; broken lines correspond to the nodal planes of the ‘best double couple’. The compression and tension axes are indicated by a plus and by a cross, respectively.

30

2

~

~..:::.

©

~

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

‘C

Fig. I (continued)

~

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31 141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

Acknowledgments

The analysis described here was performed using data from the Global Digital Seismographic

Network operated by the Albuquerque Seismological Laboratory of the U.S. Geological Survey. This research has been supported by the grant EAR88-03669 from the National Science Foundation.

32

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