Geological Survey of Western Australia (GSWA)’s Post

Earthquake Activity Intensifies on Kīlauea's Upper East Rift Zone The US Geological Survey (USGS) has reported detecting over 300 earthquakes beneath Kīlauea's summit in the past 24 hours, predominantly concentrated below the south caldera region. Despite the heightened seismic activity, Kīlauea is currently not erupting, and the USGS Volcano Alert Level remains at ADVISORY. This increase in earthquake frequency is part of a seismic swarm that commenced on June 27th. Saturday's earthquake count is expected to exceed Friday's, which itself tripled from just days ago, indicating a notable escalation in seismic activity at the volcano. #Kilauea #earthquakes #USGS #volcano #seismicactivity #Hawaii

https://lnkd.in/gtXNQifc Breaking: Earthquake hits Manicaland Oscar J Jeke Zim Now Reporter A magnitude. 3.9 earthquake with hit Nyazura, 52 km west of Mutare, this Friday, Jul 19, 2024, at 15:40 CAT. The European-Mediterranean Seismological Centre was the first to announce the earthquake at 15:49 CAT. According to Volcano Discovery the quake had a very shallow depth of 10 km (6 mi) and was not felt (or at least not reported so) Various other agencies including National Geographic have since released data on the earthquake saying estimated seismic energy released was at 4.5 x 1010 joules (12.4 megawatt hours, equivalent to 10.7 tons of TNT). The data collection and analysing centres said Mutare residents may have experienced very weak shaking while those in areas closer to the epicenter and might have experienced stronger shaking. No impact could have been felt in Harare. The last quake in the area had a magnitude of 4.5 and occurred on Sunday, May 21, 2006, at 11:55 CAT 55 km away. Join our news Channel https://lnkd.in/dFEmUtTF

【Forecasting the Epicenter Area of a Future Strong Earthquake】 Full article: https://lnkd.in/gPweFwPK (Authored by Giulio Riga and Paolo Balocchi, from Italy.) Analysis of the distribution of seismicity that falls within an area is important in determining the area where a strong earthquake is likely to occur in the future. This study observes the proximity relationship between the #epicenter of a strong earthquake and the surface trace of the seismogenic source, proposes a model to analyze the distribution of seismicity related to earthquake #sequences preceding strong earthquakes, through a polynomial function, and derives a curve characterized by one or more Up and Down concavities that are ascribable to areas of asperity or earthquake clusters, where a future strong earthquake may most likely nucleate. #Mainshock #Asperity  

The Groundbreaking Experiment in Earthquake Control at Rangely, Colorado, Revisited The study implies that even slight anthropogenic stress changes could potentially induce seismic activity on faults within tectonically inactive areas. https://lnkd.in/gw5Hv63x New insights into the Rangely earthquake control experiment https://lnkd.in/gCXfJRkd Did stresses from the Cerro Prieto Geothermal Field influence the El Mayor-Cucapah rupture sequence? The impact of production activities within the Cerro Prieto Geothermal field significantly affects the local stress field and should not be overlooked in local seismic hazard assessments. https://lnkd.in/gjH9d4rz

【Forecasting the Epicenter Area of a Future Strong Earthquake】 Full article: https://lnkd.in/gWhvzvAv (Authored by Giulio Riga and Paolo Balocchi, from Italy.) Analysis of the distribution of seismicity that falls within an area is important in determining the area where a strong earthquake is likely to occur in the future. This study observes the proximity relationship between the #epicenter of a strong earthquake and the surface trace of the seismogenic source, proposes a model to analyze the distribution of seismicity related to earthquake #sequences preceding strong earthquakes, through a polynomial function, and derives a curve characterized by one or more Up and Down concavities that are ascribable to areas of asperity or earthquake clusters, where a future strong earthquake may most likely nucleate. #Mainshock #Asperity  

Scientists continue to gain insight into earthquake aftershocks, and the Nov. 30, 2018 magnitude 7.1 Anchorage Earthquake offers a bit of a surprise. The rate of aftershocks from this event continues to be higher than the prior background level, even 5 years later. The red line shows the 2023 seismicity rate, and it is steeper than the "background," or rate prior to Nov. 2018. According to AEC seismologist Natalia Ruppert, aftershock sequences may exhibit different behaviors because there are different types of earthquakes in different types of tectonic settings. Early estimates of the decay rate suggested the M7.1 aftershocks should have lasted about 3 years. “Normally, five years after the fact we wouldn’t expect so many aftershocks for a magnitude 7 earthquake,” says Ruppert, but on the other hand the fault that ruptured in this event didn’t break the surface, so we can’t directly observe it and we don’t fully know its properties. “You should definitely expect more aftershocks, and they are slowing down, but not as quickly as we expected,” Ruppert says. We have a couple of stories on our website about aftershocks: https://lnkd.in/gCKjQaZr https://lnkd.in/gjHtYT_R https://lnkd.in/gmkJFUn2

Understanding 'normal' earthquake activity in Yellowstone is crucial for monitoring volcanic systems. Despite the yearly range of 1,500–2,500 earthquakes, with occasional swarms, seismic monitoring since 1995 provides valuable insights into the dynamic nature of Yellowstone, debunking misconceptions about eruption imminence based solely on elevated seismicity. #YellowstoneSeismicActivity #VolcanoMonitoring https://lnkd.in/gjyQhpTe

【Forecasting the Epicenter Area of a Future Strong Earthquake】 Full article: https://lnkd.in/gRBGv2rT (Authored by Giulio Riga and Paolo Balocchi, from Italy.) Analysis of the distribution of seismicity that falls within an area is important in determining the area where a strong earthquake is likely to occur in the future. This study observes the proximity relationship between the #epicenter of a strong earthquake and the surface trace of the seismogenic source, proposes a model to analyze the distribution of seismicity related to earthquake #sequences preceding strong earthquakes, through a polynomial function, and derives a curve characterized by one or more Up and Down concavities that are ascribable to areas of asperity or earthquake clusters, where a future strong earthquake may most likely nucleate. #Mainshock #Asperity   Submission link of new manuscripts: https://lnkd.in/gV3w6cSd

Understanding 'Normal' Earthquake Activity in Yellowstone National Park: Monthly seismicity reports and alert levels are crucial for assessing volcanic activity, with Yellowstone's "normal" alert level tied to typical background seismicity. The region experiences 1,500–2,500 earthquakes annually, but the dynamic nature of Yellowstone, marked by earthquake swarms and continuous monitoring improvements since 1995, underscores the complexity of evaluating seismic patterns, emphasizing that elevated seismicity doesn't necessarily indicate an imminent eruption. #YellowstoneVolcano #SeismicMonitoring #EarthquakeImpact #earthquakes #retrofitting #disasterpreparedness #propertyinvestment #propertymanagement https://lnkd.in/gGyx3DvR

✨OPEN ACCESS✨ Distinct Yet Adjacent Earthquake Sequences near the Mendocino Triple Junction: 20 December 2021 Mw 6.1 and 6.0 Petrolia, and 20 December 2022 Mw 6.4 Ferndale #TSR In northern California, the Mendocino Triple Junction marks the transition from strike-slip faulting associated with the San Andreas fault to Cascadia subduction, in which the Gorda plate slips beneath North America. In December of 2021, the Petrolia earthquake sequence struck this region with magnitude 6.1 and 6.0 events and subsequence aftershocks. A year later, the magnitude 6.4 Ferndale sequence kicked off another round of shaking. To discover active faults and understand the relationship between these sequences, scientists from the U.S. Geological Survey (USGS) applied an automated deep‐learning workflow to create enhanced and relocated earthquake catalogs for both the sequences. The catalog includes more than 14,000 newly identified earthquakes with magnitudes between 0 and 2, as well as 852 of the 860 events that had already been found by other methods. The team explored the enhanced catalog, and found that the 2021 Petrolia and 2022 Ferndale sequences were distinct in space and time, but adjacent in space. For details, please visit this OPEN ACCESS paper. https://lnkd.in/guCp74mc