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A 4.3 magnitude earthquake near Perry, Oklahoma on April 9. USGS

Four Earthquakes Rattle‬ Northern ‪Oklahoma in 24 Hours

A 4.3 magnitude earthquake that rattled Northern Oklahoma early Monday morning was the fourth temblor to strike the region in the past 24 hours.

In fact, a dozen-plus earthquakes, ranging from magnitudes of 2.5 to 4.6, have been recorded in the Sooner State since Friday, according to the U.S. Geological Survey.

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USGS recorded two 4.2-magnitude earthquakes near Enid, Oklahoma on March 4.

Two 4.2-Magnitude Earthquakes Rattle Northern Oklahoma in a Single Evening

Two 4.2-magnitude earthquakes struck near Enid in northern Oklahoma Sunday at 5:17 p.m and 9:40 p.m., according to the U.S. Geological Survey (USGS). They are the largest recorded this year so far and even felt in neighboring Kansas.

The large quakes were followed by two smaller ones around the same area early Monday. The first was a magnitude 2.7 followed by 12:35 a.m. then magnitude 2.6 at 6:16 a.m.

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Fracking
House damage in central Oklahoma from the magnitude 5.6 earthquake on Nov. 6, 2011. Wikimedia Commons

Oklahoma Quakes Linked to Wastewater Injection Depth

The alarming string of earthquakes that have shaken Oklahoma for years has long been tied to the large volume of fracking wastewater dumped into the state's injection wells. And while state regulators have taken numerous measures to reduce wastewater disposal volumes to prevent such "induced" earthquakes, they might want to consider another measure—restricting how deep wastewater gets sent underground.

A new study, published Thursday in the journal Science, finds that Oklahoma's earthquakes can also be triggered by wastewater injection depth.

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Climate
Collapsed Santa Monica Freeway bridge across La Cienega Boulevard, Los Angeles after the Northridge earthquake, Jan. 17, 1994. Robert A. Eplett / FEMA

California’s Other Drought: A Major Earthquake Is Overdue

By Richard Aster

California earthquakes are a geologic inevitability. The state straddles the North American and Pacific tectonic plates and is crisscrossed by the San Andreas and other active fault systems. The magnitude 7.9 earthquake that struck off Alaska's Kodiak Island on Jan. 23, was just the latest reminder of major seismic activity along the Pacific Rim.

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Climate
The U.S. National Tsunami Warning Center issued a tsunami for the entire western coasts of U.S. and Canada early Tuesday morning following a magnitude 7.9 earthquake off the coast of Alaska near small city of Kodiak. USNTWC

7.9 Earthquake in Alaska, West Coast Tsunami Warning Canceled

This is a breaking story and will be updated. Check back for new information...

Update (7:48 a.m. ET):

The U.S. National Tsunami Warning Center canceled a west coast warning for the U.S., following a magnitude 7.9 earthquake off the coast of Alaska near small city of Kodiak. The warning it remains in effect for some local areas, after it issued one in the early morning hours following a large earthquake beneath the Gulf of Alaska.

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More Than 300 Dead and Thousands Injured After Massive Earthquake Strikes Iran-Iraq Border

By Jake Johnson

Rescue teams in Iran and Iraq continued urgently searching through the rubble of collapsed buildings Monday after a powerful 7.3 magnitude earthquake struck the nations' border region Sunday night, killing more than 300 people and injuring thousands.

More than 100 aftershocks reportedly followed the quake, which forced thousands to flee from their homes and subsequently sparked landslides that hindered rescue efforts.

According to Iranian Red Crescent, a disaster relief organization, the earthquake and its aftermath has left more than 70,000 people in need of emergency shelter.

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Politics
North Korea's Punggye-ri nuclear test site. Google Earth

Fears of Radiation Leak Soar After North Korea Nuclear Site Collapse Kills 200

Experts are issuing urgent warnings of a possible radiation leak following the collapse of a tunnel at North Korea's Punggye-ri nuclear test site, an accident that reportedly killed at least 200 people.

"Should [the Punggye-ri site] sink, there is a possibility" that hazardous radioactive gas could be released into the atmosphere, warned South Korea weather agency chief Nam Jae-cheol during a parliamentary meeting on Monday, ahead of reports of the incident.

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Hundreds Dead in Mexico After Earthquake Strikes on Anniversary of Devastating 1985 Quake

In Mexico, a massive 7.1-magnitude quake struck 100 miles southeast of Mexico City Tuesday, collapsing dozens of buildings around the capital city and trapping schoolchildren, workers and residents beneath the rubble.

At least 217 people are dead, and hundreds more are missing. Among the dead are least 21 students at a primary school in Mexico City and 15 worshipers who died during a Catholic mass when the earthquake triggered an eruption at a volcano southeast of the city.

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Energy
A fracking operation. Lock the Gate Alliance / Flickr

Fracking Debate Ramps Up Again in Illinois With First Permit Application Under New Rules

By Kari Lydersen

Four years ago, the Illinois legislature passed a law to regulate high volume hydraulic fracturing, or fracking, after months of contentious negotiations between oil industry interests, environmental watchdogs and community groups.

Leading up to the law's passage, companies had secured hundreds of leases to potentially frack in Southern Illinois.

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