EARTHQUAKES

NOAA

How will we know a tsunami may be coming?

Other than feeling the ground shake, we rely on tsunami warning centers to alert us about potential risk.  Dr. Lori Dengler explains the process for accessing and communicating a tsunami hazard.


When an earthquake happens, responding appropriately and efficiently will save lives. 


Dr. Lori Dengler gives us a primer for the science of tectonics.


Another earthquake was felt across the Humboldt Bay area, and theUSGS says that it's a 4.6M (downgraded from 4.7). Presently there is NO tsunami warning in effect.  The Redwood Coast Tsunami Work Group says that a followup 3.0M event is an aftershock. 

USGS

[This article has been updated to reflect a revised assessment.]

An earthquake occurred at 9:24 AM today. The magnitude 4.5 event occurred 11 miles west-southwest of Eureka, according to a USGS report. 

The hypocentral depth is 19 km (12 miles). There is no tsunami threat at this time, according to the Pacific Tsunami Warning Center.

In the early morning hours of February 27, 2010, Martina Marturana felt a slight tremor that lasted a long time.  The 12-year-old lived on Robinson Crusoe Island, 325 miles off the coast of central Chile. She looked out the window and noticed the boats in the harbor moving in an unusual way, and ran to ring an alarm bell in the town square. Eight people died in her village but she is credited with saving over 600!


Geologist Lori Dengler says a Tsunami Communications Test is coming. 

On the morning of March 28th, folks will encounter alert tones, texts and other messages announcing the test. This is a preparedness effort for a tsunami coming from afar.

To learn about receiving emergency alert notifications, click here.


The Telegraph

On this segment of Shaky Ground, Geologist Lori Dengler takes on tales of earthquakes swallowing up hapless critters.


The California Earthquake Alliance has developed seven steps for earthquake safety. 

Geologist Lori Dengler emphasizes "step 1": Recognize your hazards.


Geologist Lori Dengler encourages all of us to take part in the Great California ShakeOut Drill, an annual event to practice what to do when you feel an earthquake.

Click here for details on the ShakeOut and more emergency preparedness information.


Geologist Lori Dengler discusses notification systems for hazards and emergencies...

Beyond television and radio, alerts can be sent to you via phone or email. Dr. Dengler encourages signing up to be notified!


FEMA, the Federal Emergency Management Agency, has been very busy this year. Lori Dengler discusses disaster declarations and some of the financial considerations for recovery following a catastrophic event.


Early in September, USGS detected an explosion in North Korea. How did they know it was an explosion and not an earthquake? Geologist Lori Dengler discusses the finer points of energy release that distinguish earthquakes from underground testing of bombs.


Mexico was the first country in the world to develop and implement an earthquake early warning system.

Within seconds of the recent 8.1 quake in southern Mexico, the temblor's location and magnitude were calculated and alerts were sent to neighboring communities.  Geologist Lori Dengler talks about the importance of this effective early warning system.


The goal of an evacuation is to get people out of harm's way...

It's hard to leave the comfort of our homes in an emergency. But when the call to evacuate comes, what will you do? Geologist Lori Dengler encourages heeding evacuation notices.


HSU Geology Dept.

We all know phony stories abound on social media. When it comes to geologic occurrences, Dr. Lori Dengler says be careful when fantastical stories catch your eye - fact check with trusted sources like USGS - and don't share unverified stories.


Geologist Lori Dengler discusses the rare total solar eclipse. Seismologists have long studied the moon and sun's influences on our planet and determine that this special alignment does not trigger earthquakes. Gravitationally speaking, the eclipse is nothing special.


Current digital networks and analytical techniques have vastly improved our understanding of earthquakes.  

Data is processed within minutes of a temblor... Geologist Lori Dengler reckons these initial estimates are "pretty darn good."


Earthquakes occur on faults and fault ruptures many miles beneath the surface.  Dr. Lori Dengler says we needn't worry about storms and surface water affecting our seismic reality.


HSU Geology Dept.

Small earthquakes really don't do much for stress release - but they do facilitate healthy discussions about preparedness. 

Dr. Lori Dengler shares some logarithmic understanding of the smaller quakes in our region.


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