Publication Date:
2017-04-04
Description:
We present a new P wave and S wave velocity model for the upper crust beneath Long
Valley Caldera obtained using local earthquake tomography and receiver function
analysis. We computed the tomographic model using both a graded inversion scheme and
a traditional approach. We complement the tomographic Vp model with a teleseismic
receiver function model based on data from broadband seismic stations (MLAC and
MKV) located on the SE and SW margins of the resurgent dome inside the caldera. The
inversions resolve (1) a shallow, high‐velocity P wave anomaly associated with the
structural uplift of a resurgent dome; (2) an elongated, WNW striking low‐velocity
anomaly (8%–10 % reduction in Vp) at a depth of 6 km (4 km below mean sea level)
beneath the southern section of the resurgent dome; and (3) a broad, low‐velocity volume
(∼5% reduction in Vp and as much as 40% reduction in Vs) in the depth interval 8–14 km
(6–12 km below mean sea level) beneath the central section of the caldera. The two
low‐velocity volumes partially overlap the geodetically inferred inflation sources that drove
uplift of the resurgent dome associated with caldera unrest between 1980 and 2000, and
they likely reflect the ascent path for magma or magmatic fluids into the upper crust beneath
the caldera.
Description:
Published
Description:
B12314
Description:
3.3. Geodinamica e struttura dell'interno della Terra
Description:
JCR Journal
Description:
reserved
Keywords:
Seismic Tomography
;
Long Valley Caldera
;
Receiver Function
;
04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
