Affiliation:
1. CEA Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology, Guangdong Earthquake Agency Guangzhou China
2. Istituto Nazionale di Geofisica e Vulcanologia (INGV) Rome Italy
3. Institute of Eco‐Environmental Research Guangxi Academy of Sciences Nanning China
4. Department of Earth and Space Sciences Southern University of Science and Technology Shenzhen China
Abstract
AbstractOn 15 January 2022, the largest eruption of the Hunga‐Tonga volcano in recorded history produced a plume registered by multi‐parametric instruments around the world. However, the far‐field hydrogeological responses to Lamb waves from this eruption remain underexplored. We studied the responses of groundwater to the volcanic eruption in the far‐field over 8,700 km, including 274 wells. Results show that the Lamb waves with a speed of 316 m/s affects the groundwater system, leading to similar fluctuations in well water level (WL) and opposite phase fluctuation in borehole strain. Different wells exhibit diverse responses in WL amplitudes, possibly for heterogeneities in local aquifer systems. Gain values of 5 wells that simultaneously measure atmospheric pressure, borehole air pressure, borehole strain and WL are consistent with results obtained through cross‐power spectrum estimation. This work demonstrates a novel response in far‐field groundwater systems induced by Lamb waves and expects application for aquifer parameter estimation.
Funder
National Key Research and Development Program of China
Istituto Nazionale di Geofisica e Vulcanologia
Publisher
American Geophysical Union (AGU)