Authorities say more than 35,000 students in Arizona will take part in a multistate earthquake drill.

TEMPE, Ariz. (AP) — Most people would think earthquakes are rare in Arizona. But a new study published by Arizona State University researchers found nearly 1,000 earthquakes rattling the state over a three-year period.

The southern end of the San Andreas Fault may be overdue for a large earthquake that could heavily damage the Los Angeles area, scientists have concluded after studying a record of ancient quakes and flooding around the seismically active region of the Salton Sea.

An earthquake early warning system -- like the one that saved lives last month in Japan -- could be operating in California within five years, giving residents a full 60 seconds to prepare for a Big One, leading seismic researchers said Tuesday.

When Phoenix residents felt the strong earthquake that rocked Baja California on Sunday, disbelief and a sense of excitement quickly spread.

BEIJING - Rescue teams headed to China's southwestern Sichuan province after a 6.1 magnitude earthquake killed 22 people and injured hundreds, local authorities said Sunday.

RENO, Nev. - A months-long swarm of earthquakes picked up again Sunday as a string of minor temblors rattled Reno, causing downtown high-rises to sway and knocking items off walls and shelves.

RENO, Nev. - Dozens of minor earthquakes shook Reno on Sunday as a series of temblors entered its third month and prompted some frazzled residents to leave their homes.

ISLAMABAD, Pakistan - A magnitude-5.2 earthquake shook Pakistan's capital and the northwestern region on Sunday, but there were no immediate reports of injuries or damage.

MUZAFFARABAD, Pakistan - With snow falling in parts of Kashmir, harried relief workers tried to reach remote areas on foot Thursday as the U.N.'s emergency relief chief warned time was running out for many survivors of South Asia's massive earthquake.

MOUNT ST. HELENS NATIONAL MONUMENT, Wash. - Mount St. Helens belched steam thousands of feet above the volcano's crater Monday, apparently the largest burst yet as days of tremors and low-level earthquakes have raised fears the volcano will blow at any moment.

"I hope everyone at some point has had a course that mentioned beta decay," Texas A &M professor John Hardy says to a mostly male audience wearing the latest in scientist style: Button-down, short-sleeved plaid shirts without pocket protectors.