SEABEAM DEPTH CHANGES ASSOCIATED WITH RECENT LAVA FLOWS, COAXIAL SEGMENT, JUAN-DE-FUCA RIDGE - EVIDENCE FOR MULTIPLE ERUPTIONS BETWEEN 1981-1993

被引:71
作者
CHADWICK, WW [1 ]
EMBLEY, RW [1 ]
FOX, CG [1 ]
机构
[1] NOAA,HATFIELD MARINE SCI CTR,PMEL,NEWPORT,OR 97365
关键词
D O I
10.1029/94GL01895
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
After a swarm of earthquakes was detected on the CoAxial segment of the Juan de Fuca Ridge in June-July 1993, the area was resurveyed with SeaBeam multibeam sonar to search for depth changes associated with a submarine volcanic eruption. Quantitative comparison of the 1993 SeaBeam survey with surveys in 1981/82 and 1991 shows one area of seafloor depth change (up to 29 m) between 1991-93 exactly where a pristine lava flow was discovered. In addition, two other depth anomalies (up to 37 m and 20 m) are identified between 1981-91, evidence that other recent eruptions have occurred along this spreading ridge segment.
引用
收藏
页码:167 / 170
页数:4
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