title: Spasmodic tremor and possible magma injection in long valley caldera, eastern california.
abstract: Intensive microearthquake swarms with the appearance of volcanic tremor have been observed in the southwest part of Long Valley caldera, southeastern California. This activity, possibly associated with magma injection, began 6 weeks after several strong (magnitude 6+) earthquakes in an area south of the caldera and has continued sporadically to the present time. The earthquake sequence and magmatic activity are part of a broad increase in tectonic activity in a 15,000-square-kilometer region surrounding the "White Mountains seismic gap," an area with high potential for the next major earthquake in the western Great Basin.
authors.forename: A
authors.initials: A
authors.lastname: Ryall
authors.forename: F
authors.initials: F
authors.lastname: Ryall