Verification of Pressure Surge Effect in the Fracture

Session: Mechanisms of Induced Seismicity: Pressure Diffusion, Elastic Stressing and Aseismic Slip [Poster]
Type: Poster
Date: 4/29/2020
Time: 08:00 AM
Room: Ballroom
Description: 

When a seismic wave passing through a fluid-filled fracture, it will excite a large-amplitude, slow velocity pressure wave in the fracture. We found via numerical modeling that the pressure change in the fracture could be 2-3 orders of magnitude larger than the pressure of the incident wave. We call this phenomenon the pressure surge effect. The pressure magnification factor depends on fracture geometry and frequency of incident waves. Here we want to verify it by lab experiment. The experiment needs to be done in low frequencies. We have successfully built a low-frequency (0.05-100hz) source and micro hydrophone to record the low frequency wavefield. The fracture model is made by putting together two pieces of plastic glass blocks. We will compare the difference between the pressure of incident wave and pressure at the tip of fractures to verify the pressure surge effect in the fracture.

Presenting Author: Yuesu Jin

Authors