NEWS AND NOTES
Airgun Excitation Experiments at Different Placement Depths in the Qilian Mountain of Gansu Province, China
Shallow Crustal Structure of the Middle‐Lower Yangtze River Region in Eastern China from Surface‐Wave Tomography of a Large Volume Airgun‐Shot Experiment
Temporal Variation of Seismic‐Wave Velocity Associated with Groundwater Level Observed by a Downhole Airgun near the Xiaojiang Fault Zone
2018 One‐Year Seismic Hazard Forecast for the Central and Eastern United States from Induced and Natural Earthquakes
The Relationship between and : A Review and Application to Induced Seismicity in the Groningen Gas Field, The Netherlands
Toward the Origin of Long‐Period Long‐Duration Seismic Events during Hydraulic Fracturing Treatment: A Case Study in the Shale Play of Sichuan Basin, China
Homogeneous Estimation of Moment Magnitude for Small‐to‐Moderate Magnitude Earthquakes Located near the Border between Japan and Taiwan
Evaluating the 2016 One‐Year Seismic Hazard Model for the Central and Eastern United States Using Instrumental Ground‐Motion Data
The 1755 Cape Ann Earthquake Recorded in Lake Sediments of Eastern New England: An Interdisciplinary Paleoseismic Approach
Front: Scientists in China have made tremendous efforts to use large-volume airguns to create a repeatable and powerful source for imaging subsurface structures and monitoring temporal changes of seismic velocities. The two top panels show similar seismic profiles, one from a chemical explosion and another from stacked airgun shots. The photo was taken immediately following an airgun shot in Yunnan province, Southwest China, and shows air bubbles that have risen to the surface. These results and more are described in detail in the six articles included in the SRL Focus Section on Nonexplosive Source Monitoring and Imaging (this issue). Photo by Baoshan Wang.
Back: Receiver velocities derived from single-frequency high-rate (≥1 Hz) carrier-phase observations can be used to turn GNSS instruments into velocity meters of unlimited dynamic range, potentially in real time, enabling instantaneous investigation of large, rapid motions. Grapenthin et al. (this issue) reports on the application of this technique to the 125-km-deep 2016 Mw 7.1 Iniskin, Alaska, earthquake, which created only small permanent surface offsets but much larger dynamic displacements.
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