Subduction zone extension faults, combined hazards of major earthquakes Virginia Tech News

Normally, the uplift caused by tectonic plates moving underneath, called uplift, from subduction zone earthquakes can reach 1 to 3 metres. This is true of most land-based sites affected by the 1964 earthquake, which hit 9.2 on the Richter scale. However, on Montagu Island, spaced faults created 11 meters of uplift and began draining a coastal lagoon, effectively changing its ecosystem from a marine lagoon to a freshwater marsh.

“The island is kind of stuck in the middle of these faults, so any time these faults rupture, they actually record uplift,” DePaulis said. “It has this exaggerated height, which is not common in earthquakes that only occur in a subduction zone.”

DePaolis and her team examined the effects of an extensional fault rupture on Montagu Island. By analyzing 42 sediment samples, they found stratigraphic evidence of the 1964 earthquake and secondary metamorphism caused by the extensional fault. They noticed a clear change in the sediments from lake silt before the earthquake to rooted soil after the earthquake.

“There are certainly islands that are uplifted by subduction zone earthquakes, but they don't necessarily have faults running through them that cause this exaggerated uplift, so it's a really unique place,” said Dora, an affiliate faculty member at the Center for Global Change and the Fralin Life Sciences Institute. .

The researchers believe that a secondary shift from divergence errors was possible. But this idea has been only theoretical so far because this is the first known landmass to record stratigraphic evidence.

The team members also used diatoms, a type of siliceous microalgae preserved within sediments that are sensitive to changes in salinity, to reconstruct ancient environmental changes that occurred following the 1964 earthquake. They found a clear shift from a hypersaline marine lake environment beyond the reach of the tides, suggesting To the height of the coast.

By comparing core sample results from the 1964 earthquake with samples deeper in coastal strata, the research team discovered sedimentary and diatomaceous evidence for three other cases in which an extensional fault ruptured. This evidence is associated with four of the last eight documented subduction zone earthquakes in the region.

“There is a tremendous amount of displacement on these faults that can create really fast, localized, large tsunamis,” DePaulis said. “So, the local tsunami comes very quickly, and right after that, we will have the tsunami that was created by the subduction zone itself. Suddenly, you have these huge, destructive tsunamis coming quickly one after the other.”

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