Devastating long-distance impact of earthquakes

In 2006 the island of Java, Indonesia was struck by a devastating earthquake followed by the onset of a mud eruption to the east, flooding villages over several square kilometers and that continues to erupt today. Until now, researchers believed the earthquake was too far from the mud volcano to trigger the eruption. Geophysicists have now use computer-based simulations to show that such triggering is possible over long distances.

How Often do Earthquakes Occur?

How often do earthquakes occur?

To most people’s surprise, significant worldwide earthquake activity happens at a phenomenal rate. The number of worldwide earthquakes registering M4.0 or stronger ranges between 100 – 500 events per week; activity in the M5+ range happens between 5 – 70 times per week; and it is unusual when a M6+ quake does not happen somewhere on the planet during a week.

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Some volcanoes ‘scream’ at ever higher pitches until they blow their tops

Swarms of small earthquakes can precede a volcanic eruption, sometimes resulting in “harmonic tremor” resembling sound from some musical instruments. A new analysis shows tremor during a 2009 sequence at Alaska’s Redoubt Volcano glided to substantially higher frequencies, then stopped abruptly just before six of the eruptions.

Induced seismicity? Recent spike of earthquakes in the central and eastern U.S. may be linked to human activity

The number of earthquakes has increased dramatically over the past few years within the central and eastern United States. More than 300 earthquakes above a magnitude 3.0 occurred in the three years from 2010-2012, compared with an average rate of 21 events per year observed from 1967-2000. This increase in earthquakes prompts two important questions: Are they natural, or human-made? And what should be done in the future as we address the causes and consequences of these events to reduce associated risks? U.S. Geological Survey scientists have been analyzing the changes in the rate of earthquakes as well as the likely causes, and they have some answers.

Distant earthquakes trigger tremors at U.S. waste-injection sites, says study

Large earthquakes from distant parts of the globe are setting off tremors around waste-fluid injection wells in the central United States, says a new study. Furthermore, such triggering of minor quakes by distant events could be precursors to larger events at sites where pressure from waste injection has pushed faults close to failure, say researchers. Among the sites covered are central Oklahoma, western Texas and southern Colorado.

Review Post-Earthquake Plans

Review Post-Earthquake Plans

Check and Renew Provisions:

Check supply of emergency food and water. Check medication, first aid materials, for all members of the houshold including the children, handicapped and elderly. Replenish expired supplies of food, water medecine, fire extinguishers, and batteries.

Review Family Plans:

Review the responsibility of each familly member after an earthquake. Call the designated contact person outside the area to remind them of their role. Review plans to pick up children and check with schools or daycare centers to ensure the family plan in still appropriate.

Review Community Plans:

Contact your neighbors periodically to review earthquake plans. Contact your local Office of Emergency Services for an update on the local emergency plan.


These tips were developed by California’s Governor’s Office of Emergency Services.


Why do Earthquakes Happen ?

What causes earthquakes?

Just below Earth’s surface, the crust layer is divided up into several “plates”, which are always moving slightly. Between these plates are fault lines, which is where the plates come together. At these fault lines, the plates are constantly rubbing and sliding against each other, but sometimes due to irregularities and high friction, the plates become locked and stop moving.

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What is a Tsunami?

 What are Tsunamis?

On Boxing Day 2004 a horrific wave swept across the Indian Ocean killing over two hundred and thirty thousand people. After receiving massive media coverage, the topic of Tsunamis became widely discussed for a time before dying down. However, this topic of discussion returned abruptly in March 2011 when a Tsunami devastated the Japanese East Coast. But what are Tsunamis? What causes them?

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How to Survive an Earthquake

 Survive an Earthquake

Before An Earthquake

Long before an earthquake hits, make a plan for your family as to where everyone should go and where to meet afterwards. Decorate your home appropriately by not hanging heavy mirrors or pictures over sleeping areas in bedrooms or behind couches, in case they are shaken off the wall. Stock up on earthquake emergency food supplies, including extra batteries, battery operated radios, flashlights, blankets, extra water and canned food and medical supplies. It is a good idea to stock tools to turn off gas and water valves as well as the electricity.

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