TY - JOUR
T1 - Converted T phases recorded on Hawaii from polynesian nuclear tests
T2 - A preliminary report
AU - Okal, E. A.
N1 - Funding Information:
I am grateful to Jacques Talandier for many years of stimulating collaboration in the field of Pacific T waves, and to Paul Okubo for access to the HVO archives. The maps on Figure 1 were drawn using the GMT software by WESSEL and SMITH (1991). I thank Donna Blackman for constructive comments. This research is supported by the Defense Threat Reduction Agency of the Department of Defense, under Grant DSWA01-98-1-0007.
PY - 2001
Y1 - 2001
N2 - We present a preliminary study of T waves from Polynesian nuclear tests at Mururoa, recorded on digital stations of the Hawaii Volcano Observatory network, following their conversion to seismic waves at the southern shore of the Island of Hawaii, and subsequent propagation to the recording stations. We show that seismograms are composed of several packets, which can be interpreted as resulting from T → P and T → S conversions, and which feature distinct spectral characteristics. As the distance from the shoreline to the station increases, the relative importance of the several wave packets changes; a prominent shadow for T → P is found at 8-12 km from the shore. This pattern is affected by the local crustal structure; in a favorable case, propagation in deep, low-attenuation layers resulted in a clear record as far as 76 km from the shoreline. While these results are generally robust, they can be moderately affected by a change of location of the source inside Mururoa Atoll.
AB - We present a preliminary study of T waves from Polynesian nuclear tests at Mururoa, recorded on digital stations of the Hawaii Volcano Observatory network, following their conversion to seismic waves at the southern shore of the Island of Hawaii, and subsequent propagation to the recording stations. We show that seismograms are composed of several packets, which can be interpreted as resulting from T → P and T → S conversions, and which feature distinct spectral characteristics. As the distance from the shoreline to the station increases, the relative importance of the several wave packets changes; a prominent shadow for T → P is found at 8-12 km from the shore. This pattern is affected by the local crustal structure; in a favorable case, propagation in deep, low-attenuation layers resulted in a clear record as far as 76 km from the shoreline. While these results are generally robust, they can be moderately affected by a change of location of the source inside Mururoa Atoll.
KW - Nuclear tests
KW - Seismic conversions
KW - T phases
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U2 - 10.1007/978-3-0348-8270-5_3
DO - 10.1007/978-3-0348-8270-5_3
M3 - Article
AN - SCOPUS:0035004809
VL - 158
SP - 457
EP - 474
JO - Pure and Applied Geophysics
JF - Pure and Applied Geophysics
SN - 0033-4553
IS - 3
ER -