By Raymond Zhong and Niharika Mandhana 

NEW DELHI--The earthquake that ravaged parts of Nepal on Saturday triggered an avalanche on Mount Everest that killed 10 people, according to the Nepal Mountaineering Association, making it the deadliest day in the history of climbing on the world's highest peak.

The rush of ice and snow swept through the base camp where climbers were preparing to ascend the mountain, expedition operators said. Google Inc. said Saturday that one of its engineers, Dan Fredinburg, was among the dead. It said three other Google employees on Everest were safe.

An avalanche on Everest last year killed 16 Nepali staff. That disaster sparked protests among the Nepalese who help haul climbers' gear, cook their food and set up their camps, leading many trip operators to call off their expeditions.

Ang Tshering Sherpa, the head of the Nepal Mountaineering Association, said 61 people were injured on the mountain in Saturday's disaster. The epicenter of the quake was 135 miles west of Everest.

Nima Namgyal Sherpa, a physician and mountaineer, said on Facebook that a helicopter landed at base camp early Sunday morning to evacuate the injured. "Praying for [a] few hours of good weather to complete our rescue mission," Dr. Sherpa wrote.

With this spring's Himalayan climbing season only a few weeks old, teams were at base camp acclimatizing and making preparatory hikes. Trekking companies from Katmandu to New Zealand spoke with their teams in the Himalayas by satellite phone.

Iswari Paudel, managing director of Himalayan Guides Nepal, a Katmandu-based trekking firm, said he had gotten word that the avalanche killed four people who were working on the mountain for his company.

Caroline Blaikie, operations manager at Wanaka, New Zealand-based Adventure Consultants, said the company's team on Mount Everest was safe. Russell Brice, owner of Himalayan Experience, said his team was unharmed and staying at base camp.

Buildings were also damaged in the mountainous Khumbu region that trekkers traverse to reach Everest, according to Sarad Dulal, managing director of Swissa, a Katmandu-based adventure company. Swissa had four trekkers and two guides in the area, all of whom were safe, Mr. Dulal said.

Write to Niharika Mandhana at niharika.mandhana@wsj.com

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