公开(公告)号：US20240427045A1

公开(公告)日：2024-12-26

申请号：US18752231

申请日：2024-06-24

Applicant: California Institute of Technology

Inventor： Ettore Biondi ,  Zhongwen Zhan ,  Jiaxuan Li ,  Weiqiang Zhu

IPC: G01V1/34 ,  G01V1/22 ,  G01V1/28 ,  G01V1/30

Abstract: A computer-implemented method useful for performing seismic tomography, including obtaining seismic data comprising distributed acoustic sensing (DAS) data, comprising at least one of P-wave or S-wave travel times from a plurality of seismic events to a plurality of recording stations coupled to a network of optical fibers in a geological structure; and generating tomography data from the DAS data, wherein tomography data is useful for characterizing the geological structure. We employ distributed acoustic sensing data recorded along a 100-km fiber-optic cable traversing the caldera to image its subsurface structure. Our images highlight a definite separation between the shallow hydrothermal system and the large magma chamber located at ˜12 km depth. The combination of the geological evidence with our results shows how fluids exsolved through second boiling provide the source of the observed uplift and seismicity. Thus Fiber-seismic tomography reveals that the unrest in the Long Valley Caldera is likely driven by fluid from second boiling, not new magma intrusion.

公开(公告)号：US20250020822A1

公开(公告)日：2025-01-16

申请号：US18770303

申请日：2024-07-11

Applicant: California Institute of Technology

Inventor： Jiaxuan Li ,  Weiqiang Zhu ,  Ettore Biondi ,  Zhongwen Zhan

IPC: G01V1/22 ,  E21B41/00 ,  G01D5/353 ,  G01V1/01 ,  G01V1/30

Abstract: The present invention infers the first-motion polarities using the relative polarities measured from cross-correlations. We demonstrate two real-world applications on two DAS arrays in the manuscript to illustrate the effectiveness of our method and improvements to the focal mechanism inversion.