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Trending / Undersea Quakes: Two quakes in one week off Oregon Coast

Aug 20, 2023

Ther 4.0 magnitude earthquake occurred off the Oregon Cast near Port Orford at about 12:30 Tuesday, Aug. 1.

The United States Geological Survey (USGS) reports a 4.0 magnitude earthquake occurred off the Oregon Coast near Port Orford at about 12:30 p.m. Tuesday, Aug. 1.

This is the second such undersea tremor in the area in the past seven days.

A 4.4 magnitude earthquake rattled the Oregon Coast at 6:55 a.m. July 29, but the tremors do not pose a threat of triggering a larger earthquake – but they do serve as a reminder for residents that we live in a seismically active area, according to a local expert.

The July 29 earthquake shook the ground west of Coos Bay between 200 to 400 miles offshore. It happened in the Blanco Fracture Zone, said Althea Rizzo, Geologic Hazards Program Coordinator with Oregon Emergency Management (OEM).

“It's where we have two tectonic plates offshore that are sliding past each other and it's just a really active area for these kinds of earthquakes,” Rizzo said.

This fault line has not recently seen an uptick in earthquakes, she said. It is known by seismologists to be a hot spot for quakes.

“It's constantly rocking and rolling out there,” Rizzo said.

Earthquakes that occur along this fault line do not pose a safety threat to Oregon residents.

“It's so far off shore and the earthquakes on it tend to be fairly small,” Rizzo said.

Although this particular area doesn't impact those living on the Oregon Coast, residents should be paying attention to seismic activity – or at least realize that they live in an area where a large earthquake could occur.

“It's a good reminder that earthquakes can happen at any time, and that you want to be prepared before they happen,” Rizzo said. “We encourage people to take a look at their emergency plans and talk to their family and neighbors about what they would do – and if they're over on the coast to practice their evacuation routes,” she said.

What is an earthquake

An earthquake is a sudden, rapid shaking of the ground caused by the shifting of rocks deep underneath the earth’s surface. Earthquakes can cause fires, tsunamis, landslides or avalanches, according to the U. S. Department of Homeland Security.

While they can happen anywhere without warning, areas at higher risk for earthquakes include Alaska, California, Hawaii, Oregon, Puerto Rico, Washington and the entire Mississippi River Valley.

Make an Emergency Plan

Create a family emergency communications plan that has an out-of-state contact. Plan where to meet if you get separated. Make a supply kit that includes enough food and water for several days, a flashlight, a fire extinguisher and a whistle.

Being prepared allows you to avoid unnecessary excursions and to address minor medical issues at home, alleviating the burden on urgent care centers and hospitals.

Remember that not everyone can afford to respond by stocking up on necessities. For those who can afford it, make essential purchases and slowly build up supplies.

Protect Your Home: Secure heavy items in your home like bookcases, refrigerators, water heaters, televisions and objects that hang on walls. Store heavy and breakable objects on low shelves.

Consider making improvements to your building to fix structural issues that could cause your building to collapse during an earthquake.

Consider obtaining an earthquake insurance policy. A standard homeowner’s insurance policy does not cover earthquake damage.

If an earthquake happens, protect yourself right away:

1. Drop (or Lock)

Wherever you are, drop down to your hands and knees and hold onto something sturdy. If you’re using a wheelchair or walker with a seat, make sure your wheels are locked and remain seated until the shaking stops.

2. Cover

Cover your head and neck with your arms. If a sturdy table or desk is nearby, crawl underneath it for shelter. If no shelter is nearby, crawl next to an interior wall (away from windows). Crawl only if you can reach better cover without going through an area with more debris. Stay on your knees or bent over to protect vital organs.

3. Hold On

If you are under a table or desk, hold on with one hand and be ready to move with it if it moves. If seated and unable to drop to the floor, bend forward, cover your head with your arms and hold on to your neck with both hands.

What To Do After Am Earthquake

There can be serious hazards after an earthquake, such as damage to the building, leaking gas and water lines, or downed power lines.

Expect aftershocks to follow the main shock of an earthquake. Be ready to Drop, Cover, and Hold On if you feel an aftershock.

If you are in a damaged building, go outside and quickly move away from the building. Do not enter damaged buildings.

If you are trapped, send a text or bang on a pipe or wall. Cover your mouth with your shirt for protection and instead of shouting, use a whistle.

If you are in an area that may experience tsunamis, go inland or to higher ground immediately after the shaking stops. Avoid contact with floodwaters as they can contain chemicals, sewage, and debris.

Check yourself to see if you are hurt and help others if you have training. Learn how to be the help until help arrives.

If you are sick or injured and need medical attention, contact your healthcare provider for instructions. If you are experiencing a medical emergency, call 9-1-1.

Once you are safe, pay attention to local news reports for emergency information and instructions via battery-operated radio, TV, social media or from cell phone text alerts.

Register on the American Red Cross “Safe and Well” website so people will know you are okay.

Use text messages to communicate, which may be more reliable than phone calls.

Be careful when cleaning up. Wear protective clothing, including a long-sleeved shirt, long pants, work gloves and sturdy thick-soled shoes. Do not try to remove heavy debris by yourself. Wear a mask and maintain a physical distance of at least six feet while working with someone else. Use an appropriate mask if cleaning mold or other debris. People with asthma and other lung conditions and/or immune suppression should not enter buildings with indoor water leaks or mold growth that can be seen or smelled. Children should not take part in disaster cleanup work.

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