Subsurface Structure of Long Valley Caldera Imaged With Seismic Scattering and Intrinsic Attenuation

Geologic interpretations of seismic scattering and attenuation for the Cianten Caldera and the surrounding area

The Cianten Caldera in Indonesia is immediately adjacent to the producing portion of the Awibengkok geothermal field. The Cianten Caldera contains rocks similar to those in the Awibengkok field, however, the Cianten Caldera is not capable of producing geothermal power on a commercial scale. The Cianten Caldera has been microseismically monitored along with the producing Awibengkok field as inje...

Constraints on continued episodic inflation at Long Valley Caldera, based on seismic and geodetic observations

[1] Long Valley Caldera, a large and potentially explosive silicic system, has experienced highly anomalous continued inflation since late 1970s. We characterize an episode of rapid episodic uplift occurring between 2002 and 2003 following similar episodes of 1979–1980, 1983, 1989–1990, and 1997–1998. This most recent episode was the first to be observed by a dense array of 13 continuous Global...

Separation of intrinsic and scattering seismic attenuation in the Southern Apennine zone, Italy

S U M M A R Y Scattered waves observed at the seismographs of the National Italy’s seismic network have been used to investigate the intrinsic dissipation and scattering properties of the lithosphere under the Southern Apennines, Italy. First, we investigate the coda-Q properties, then we apply the MLTW analysis in the hypothesis of velocity and scattering coefficient constant with depth, and f...

Geochronology of the Long Valley Caldera as related to the Long Valley magma chamber

Dilational processes accompanying earthquakes in the long valley caldera

Regional distance seismic moment tensor determinations and broadband waveforms of moment magnitude 4.6 to 4.9 earthquakes from a November 1997 Long Valley Caldera swarm, during an inflation episode, display evidence of anomalous seismic radiation characterized by non-double couple (NDC) moment tensors with significant volumetric components. Observed coseismic dilation suggests that hydrothermal...