TY - JOUR T1 - Hydrovolcanic Explosions at the Lava Ocean Entry of the 2018 Kilauea Eruption Recorded by Ocean‐Bottom Seismometers JF - Seismological Research Letters Y1 - 2023 A1 - Banerjee, Puja A1 - Shen, Yang AB - From the beginning of May 2018, the Kilauea Volcano on the island of Hawaii experienced its largest eruption in 200 yr followed by a period of unrest for months. Because hot molten lava entered the ocean from the ocean‐entry point near the lower East Rift Zone, the lava–water interaction led to explosions. Some explosions were near the water surface and ejected fragments of lava, also known as lava bombs. In the early morning on 16 July 2018, one of those lava bombs, which was almost the size of a basketball, hit a sightseeing boat and injured 23 people. In this study, we analyzed the hydrophone data recorded from July to mid‐September by ocean‐bottom seismometers (OBSs) deployed offshore near the ocean entry point to identify and locate the hydroacoustic signals of the lava–water explosions. Acoustic signals of hydrovolcanic explosions are characterized by a short duration (less than a few seconds) and a broad frequency range (at least up to 100 Hz). To automate event detection, a short‐term average versus long‐term average method was applied to the complete dataset. Approximately 4300 events were detected and located near the coastline and further used to prepare a catalog. The distribution of the lava–water explosions is consistent with the pattern of the offshore lava delta formed during the 2018 eruption. Identifying such hydroacoustic signals recorded by OBSs may provide new avenues of research using various seismoacoustic events associated with volcanic eruptions. UR - https://doi.org/10.1785/0220220195 ER - TY - JOUR T1 - An Improved Earthquake Catalog During the 2018 Kı̄lauea Eruption From Combined Onshore and Offshore Seismic Arrays JF - Earth and Space Science Y1 - 2022 A1 - Wei, XiaoZhuo A1 - Shen, Yang A1 - Caplan-Auerbach, Jacqueline A1 - Morgan, Julia K. KW - eruption KW - Kı̄lauea KW - offshore KW - onshore KW - seismicity AB - The Island of Hawai’i was formed by repeated eruptions of basalts at an oceanic hotspot. Kı̄lauea, the youngest among the subaerial volcanoes of the island, erupted intensely in 2018. The eruption provided an opportunity to look into the mechanisms that operate at the volcano and associated earthquake activities, as it was recorded simultaneously, for the first time, by onshore and offshore seismometers. We used most of the publicly available seismic data during the eruption period, including temporary arrays, to build a more complete earthquake catalog during the eruption than that provided by the Hawaiian Volcano Observatory. We used a short-time-average/long-time-average method to identify potential earthquakes. The detections were associated with events and automatically picked with P-wave and S-wave arrivals, which were used to locate the events in a three-dimensional velocity model. After re-examining these earthquake events, their coda/duration magnitudes were determined. The resulting half-year catalog contains 375,736 events with one of the highest daily earthquake numbers ever reported (6,128 on 21 June 2018). A great number of events were recorded during the caldera collapses, from its beginning until its rapid ending. The catalog also contains abundant events near the Pu’u‘ō‘ō vent and in the lower East Rift Zone, where an increase of seismicity in mid-July and August indicated a step-up in magma intrusion after the eruption. VL - 9 UR - https://onlinelibrary.wiley.com/doi/abs/10.1029/2021EA001979 IS - 6 N1 - _eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1029/2021EA001979 ER - TY - JOUR T1 - An OBS Array to Investigate Offshore Seismicity during the 2018 Kīlauea Eruption JF - Seismological Research Letters Y1 - 2020 A1 - Wei, XiaoZhuo A1 - Shen, Yang A1 - Caplan‐Auerbach, Jacqueline A1 - Morgan, Julia K. AB - On 3 May 2018, Kīlauea Volcano, one of the most active volcanoes in the world, entered a new eruptive phase because of a dike intrusion in the East Rift zone. One day later, an Mw 6.9 earthquake, which was likely trigged by the dike intrusion, occurred in the submarine south flank of Kīlauea Volcano. In mid‐July, an ocean‐bottom seismometer (OBS) array consisting of 12 stations was deployed on the submarine south flank of Kīlauea Volcano to monitor the aftershocks and lava–water interaction near the ocean entry. Eleven OBSs were recovered in mid‐September. Preliminary evaluation of the data reveals a large number of seismic and acoustic events, which provide a valuable dataset for understanding flank deformation and stability as well as lava–water interaction. Here, we introduce this dataset and document notable instrument malfunctions along with some initial seismic and acoustic observations. VL - 92 UR - https://doi.org/10.1785/0220200206 IS - 1 ER - TY - JOUR T1 - A Preliminary Full‐Wave Ambient‐Noise Tomography Model Spanning from the Juan de Fuca and Gorda Spreading Centers to the Cascadia Volcanic Arc JF - Seismological Research Letters Y1 - 2015 A1 - Gao, Haiying A1 - Shen, Yang VL - 86 UR - https://pubs.geoscienceworld.org/srl/article/86/5/1253-1260/315528 ER -