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
~,
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.
23
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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
~
~..:::.
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~
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
References
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