Kilauea earthquake swarms, deformation stop

USGS: “This map depicts intrusive activity detected during the past week at Kīlauea volcano. The initial swarm of small earthquakes from August 23-25 ​​was centered in the southern caldera, shown on the map. A second swarm began in Late August 26 in the same area Earthquake numbers decreased the next day, but remained above background levels and earthquake epicenters shifted away from the caldera to the Southwest Rift Conductor. ), centered within a dashed ellipse on the map.The Southwest Mosel Rift—also named on the map—is an underground passage of magma in the Southwest Kīlauea Rift, and for decades was a known source area for earthquakes.The Mosul area deflects to the southeast of the main line. of volcanic vents denoting the southwest rift zone, as evidenced by the 1971 volcanic vents and the 1919–1920 Mauneki lava shield on the map.Volcanic eruptions from Mosul itself are believed to be rare, although A brief but spectacular eruption occurred in this area on December 31, 1974, resulting in a lava flow that traveled more than 12 km (7.5 mi) to the southwest. “

(BIVN) – It appears that the supply of new magma intrusion beneath the surface south of Kīlauea’s summit caldera appears to have slowed or stopped, scientists say.

Kīlauea volcano is not erupting, and after a slight increase in activity recently raised the volcano alert level from advisor to WATCH for a while, things have settled down.

The USGS Hawaii Volcano Observatory reported Tuesday that “seismic rates under the southern portion of the Colau’a Summit caldera and extending to the southwest have decreased over the past 24 hours.” “Ground deformation in the Kīlauea summit area associated with the intrusion has stopped since yesterday afternoon, August 30. Other monitoring data streams, including SO2 emission rates and webcam views, show no changes.”

Currently, there is no indication that the Halema’uma’u vent eruption will resume, says the USGS. No unusual activity was observed in the Eastern Rift Zone.

USGS: “A temporary GPS location has been set up to the south of Kīlauea’s caldera summit to measure vertical and horizontal ground motion during last week’s intrusion. Solar panels (bottom center) provide power to the instrument as it collects data. Courtesy and in coordination with Hawai’i Volcanoes National Park, This GPS location has been deployed in an area still close to the public for safety reasons. The Northeast Rift Zone on Mauna Loa is shown in the background.” USGS photo taken by S. Conway on August 25, 2021.

From the USGS observations report:

In the past 24 hours, 33 subsurface earthquakes have been detected within and southwest of the Kolawea summit caldera, extending into the Koa’e fault zone. Most earthquakes are less than magnitude 2 and occur 1-4 km (0.6-2.5 mi) below the surface. Measurements of summit tilt continued to record inflation and change in the Earth’s deformation pattern until around noon yesterday, August 30, after which the ground deformation associated with this event ceased. These observations indicate that the supply of new intrusive subsurface magma south of the Colawea Peak caldera has slowed or stopped.

Emission rates of sulfur dioxide (SO2) remain at very low levels that have persisted since May 2021, when the last summit eruption ended. The latest SO2 emissions rates, measured on August 26, were 45 tons per day, close to levels associated with the non-volcanic period from late 2018 to late 2020 (<50 tons per day). This is well below the emissions rates averaging over 800 tons per day from mid-February to mid-April when the Kīlauea summit eruption was ongoing.

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