A Shallow Earthquake Swarm Close to Hydrocarbon Activities: Discriminating between Natural and Induced Causes for the 2018–2019 Surrey, United Kingdom, Earthquake Sequence
Rupture Directivity Analysis of the 2018 Hokkaido Eastern Iburi Earthquake and Its Seismotectonic Implication
Thrust and Conjugate Strike‐Slip Faults in the 17 June 2018 6.1 ( 5.5) Osaka, Japan, Earthquake Sequence
The Complex Velocity Variation Induced by the Precipitation and the 2018 Eruption of the Kilauea Volcano in Hawaii Revealed by Ambient Noise
Assessing Short‐Term Clock Errors and Drifts of Temporary Seismic Networks Using the Active Airgun Source in Binchuan, Yunnan
Seismic Intensity Attenuation for Intraplate Earthquakes in Brazil with the Re‐Evaluation of Historical Seismicity
Macroseismic Study of the Devastating 22–23 October 1749 Earthquake Doublet in the Northern Colima Graben (Trans‐Mexican Volcanic Belt, Western Mexico)
METACity‐Quito: A Semi‐Dense Urban Seismic Network Deployed to Analyze the Concept of Metamaterial for the Future Design of Seismic‐Proof Cities
NEWS AND NOTES
Front: An Mw 7.5 earthquake struck Palu in the northern coast of Sulawesi island, Indonesia, on 28 September 2018. Its focal mechanism was determined to be a left-lateral strike-slip fault, which is generally expected to not produce a tsunami. However, a large tsunami with runup heights of more than 6 m was observed along the coast of Palu city. Lee et al. (this issue) detail a complex triggering supershear source model as determined by teleseismic waveform inversion that shows how horizontal movements combined with complex bathymetry and topography could have pushed seawater to generate a tsunami even though the Palu earthquake was a strike-slip event. The location map shows the epicenter (black open star) and aftershocks (white circles), with insets on the right showing (top) the north–south offset and (bottom) the azimuth displacement.
Back: Earthquakes induced by subsurface industrial activities are a globally emotive issue, and there is a growing catalog of induced earthquake sequences. However, attempts at discriminating between natural and induced causes, particularly for anomalously shallow seismicity, can be challenging. An earthquake swarm during 2018–2019 in southeast England with a maximum magnitude of ML 3.2 received great public and media attention because of its proximity to operating oilfields. Hicks et al. (this issue) detected 168 low-magnitude earthquakes and computed detailed source parameters of these events. Overall, they found no indicators in the earthquake parameters that would strongly suggest an induced source; nor did they find any clear trends between seismicity and drilling activities based on operational logs provided by the operators. The authors conclude that these earthquakes most likely offer a uniquely detailed insight into shallow seismicity within sedimentary basins.
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