Volcano Watch: More shaking on the south side of Kilauea Volcano. Did you feel it?

Hawaiians are used to feeling the ground beneath their feet. From gentle vibrations that sound like the wind to sudden shakes that knock dishes off the table, living on this volcanically active island means accepting that the ground beneath our feet won’t always stay still.

The last significant earthquake occurred on Saturday night, July 6, at 8:47 p.m. Hawaii time. The quake was a magnitude 4.1 on the Richter scale on the south side of Kilauea at a depth of about 7 km (4.4 mi) below sea level. The event triggered a number of aftershocks, including three M2 aftershocks that occurred within ten minutes of the M4.1 sea level quake.

Earthquakes that occur on the south side of Kilauea typically occur on either the Helena Fault System or a so-called “subduction” fault. The steep-slope faults on the Helena Fault System are easily visualized as they appear on the surface as steep slopes along the southeast coast of the island of Hawaii. These steep-slope faults continue through the interior of the Earth and can cause large earthquakes as rocks along the nearly vertical faults slide past each other.

The breakaway fault lies beneath the Helena Fault System. This fault runs almost horizontally down the south side of Kilauea Volcano at the interface between the island and the ocean floor. This interface can produce larger events, and according to seismologists at the USGS Hawaiian Volcano Observatory, it was likely the source of Saturday's M4.1 earthquake based on depth and motion.

Slippage along a subduction zone can occur as a result of a combination of gravity and pressure changes occurring in the volcano above. In the past 50 years, three earthquakes have occurred along a subduction zone above M6 on the south side of Kilauea.

The most recent earthquake was a 6.9 magnitude earthquake that occurred on May 4, 2018. This earthquake was caused by volcanic intrusion into the East Rift Zone of Kilauea Volcano, which led to the 2018 eruption of the lower East Rift Zone.

This collapse also caused a 6.2 magnitude earthquake in 1989. This event caused casualties, destroyed or damaged homes in the Puna area, caused landslides that blocked roads, and generated a small local tsunami.

The most devastating of the three events was in 1975, and was the largest earthquake in Hawaii since 1868. A 7.7 magnitude earthquake on the Decollement Fault beneath Kilauea caused several meters of horizontal and vertical movement along the faults in the summit and south flank areas. The earthquakes caused damage to buildings and roads, along with a tsunami that killed two local people.

In this broader context, Saturday’s 4.1 magnitude earthquake was only a minor slip along the slope of Kilauea, but the tremors felt so widely were a reminder of the region’s potential for devastating, large-scale earthquakes. More than 700 people reported feeling the latest 4.1 magnitude quake, which rippled across Hawaii to Maui and Lanai.

As residents of a very seismic island chain, the USGS's “Did You Feel It?” website is a great resource that citizens and scientists alike can use to report how we individually feel earthquakes.

While magnitude is the size of an earthquake derived from data collected by a network of seismic instruments, intensity is a measure of shaking derived from a network of people who report feeling it. Based on the felt reports, “Internet Earthquake Intensity Maps,” or CIIMS, are generated in near real time and help us understand how different types of earthquakes can affect different areas of Hawaii.

The USGS fact sheet, “Did You Feel It? Citizens Contribute to Earthquake Science,” describes the importance of seismic information models: “… As a result of work by the USGS and in collaboration with various regional seismic networks, people who experience an earthquake can go online and share information about its effects to help create a map of shaking intensity and damage… Seismic information models contribute significantly to the rapid assessment of the extent of an earthquake emergency and provide valuable data for earthquake research.”

Next time you feel an earthquake, first make sure you and your surroundings are safe. Then if you would like to support the science happening in Hawaii, please fill out your report. Thank you to everyone who reported feeling an earthquake in Hawaii; your reports help us understand the effects of earthquakes in our dynamic environment.

Volcano activity updates

Kilauea has not yet erupted. Its USGS alert level is “advisory.”

High rates of seismic activity and inflationary ground deformation continue at the Kilauea summit area, indicating that magma is re-pressuring the storage system. Over the past week, approximately 550 events (most smaller than M2) have occurred beneath the Kilauea summit area and extend southeastward into the upper East Rift Zone. Unrest may continue to wax and wane with changes in magma input; changes can occur rapidly, as can eruptions. The most recent measured summit sulfur dioxide emissions rate was approximately 60 tons per day on July 9, 2024.

Mauna Loa has not erupted yet, and the USGS volcanic alert level is at normal.

Four earthquakes were reported felt in the Hawaiian Islands over the past week: a 3.4 magnitude earthquake 0 km (0 mi) west of Pahala at a depth of 32 km (20 mi) on July 8 at 12:39 p.m. Hawaiian Standard Time, a 1.9 magnitude earthquake 7 km (4 mi) southwest of the volcano at a depth of 1 km (1 mi) on July 7 at 6:56 a.m. Hawaiian Standard Time, a 3.3 magnitude earthquake 14 km (8 mi) south of Fern Forest at a depth of 6 km (4 mi) on July 6 at 8:51 p.m. Hawaiian Standard Time, and a 4.1 magnitude earthquake 15 km (9 mi) south of Fern Forest at a depth of 6 km (4 mi) on July 6 at 8:47 p.m. Hawaiian Standard Time.

The Croatian Military Council continues to closely monitor Kilauea and Mauna Loa.

Please visit the HVO website for past Volcano Watch articles, Kilauea and Mauna Loa updates, volcano images, maps, recent earthquake information, and more. You can email questions to [email protected].

What Are The Main Benefits Of Comparing Car Insurance Quotes Online

LOS ANGELES, CA / ACCESSWIRE / June 24, 2020, / Compare-autoinsurance.Org has launched a new blog post that presents the main benefits of comparing multiple car insurance quotes. For more info and free online quotes, please visit https://compare-autoinsurance.Org/the-advantages-of-comparing-prices-with-car-insurance-quotes-online/ The modern society has numerous technological advantages. One important advantage is the speed at which information is sent and received. With the help of the internet, the shopping habits of many persons have drastically changed. The car insurance industry hasn't remained untouched by these changes. On the internet, drivers can compare insurance prices and find out which sellers have the best offers. View photos The advantages of comparing online car insurance quotes are the following: Online quotes can be obtained from anywhere and at any time. Unlike physical insurance agencies, websites don't have a specific schedule and they are available at any time. Drivers that have busy working schedules, can compare quotes from anywhere and at any time, even at midnight. Multiple choices. Almost all insurance providers, no matter if they are well-known brands or just local insurers, have an online presence. Online quotes will allow policyholders the chance to discover multiple insurance companies and check their prices. Drivers are no longer required to get quotes from just a few known insurance companies. Also, local and regional insurers can provide lower insurance rates for the same services. Accurate insurance estimates. Online quotes can only be accurate if the customers provide accurate and real info about their car models and driving history. Lying about past driving incidents can make the price estimates to be lower, but when dealing with an insurance company lying to them is useless. Usually, insurance companies will do research about a potential customer before granting him coverage. Online quotes can be sorted easily. Although drivers are recommended to not choose a policy just based on its price, drivers can easily sort quotes by insurance price. Using brokerage websites will allow drivers to get quotes from multiple insurers, thus making the comparison faster and easier. For additional info, money-saving tips, and free car insurance quotes, visit https://compare-autoinsurance.Org/ Compare-autoinsurance.Org is an online provider of life, home, health, and auto insurance quotes. This website is unique because it does not simply stick to one kind of insurance provider, but brings the clients the best deals from many different online insurance carriers. In this way, clients have access to offers from multiple carriers all in one place: this website. On this site, customers have access to quotes for insurance plans from various agencies, such as local or nationwide agencies, brand names insurance companies, etc. "Online quotes can easily help drivers obtain better car insurance deals. All they have to do is to complete an online form with accurate and real info, then compare prices", said Russell Rabichev, Marketing Director of Internet Marketing Company. CONTACT: Company Name: Internet Marketing CompanyPerson for contact Name: Gurgu CPhone Number: (818) 359-3898Email: [email protected]: https://compare-autoinsurance.Org/ SOURCE: Compare-autoinsurance.Org View source version on accesswire.Com:https://www.Accesswire.Com/595055/What-Are-The-Main-Benefits-Of-Comparing-Car-Insurance-Quotes-Online View photos