A Tsunami alert has been issued after an earthquake in Alaska of 7.9-magnitude on Richter scale was recorded off the coast of this state in the US. According to the Tsunami Warning Centre, a Tsunami warning is in effect for southeast and south Alaska, including the Alaska Peninsula and Aleutian Islands, as well as British Columbia in Canada. The US West Coast has also been kept under a Tsunami watch. The San Francisco Department of Emergency Management warned residents within three blocks of the Pacific Coast or within five blocks of the San Francisco Bay to prepare to evacuate. "So that you are ready if evacuation is needed," the agency tweeted, while the NWS Pacific Tsunami Warning Center said that, based on the preliminary earthquake parameters, "widespread hazardous tsunami waves were possible". Earlier, the earthquake struck about 175 miles southeast of Kodiak, Alaska, shortly after midnight (Alaska local time). The quake had a depth of about 15 miles, according to the United States Geological Survey (USGS). A number of smaller aftershocks were recorded nearby, as per the USGS. Tsunami sirens were also sounded in Kodiak, and the police warned: "This is not a drill," as per several media reports. Warnings from the National Weather Service sent to cellphones in Alaska warned: "Emergency Alert. Tsunami danger on the coast. Go to high ground or move inland." Tue Jan 23 12:42:38 UTC 2018 event picture pic.twitter.com\/yRyGikpdVj \u2014 NWS Tsunami Alerts (@NWS_NTWC) January 23, 2018 Kodiak police posted a video warning on their Facebook page. Kodiak emergency officials said they'd received two reports that tide levels in the city's channel were fluctuating from six inches to a foot. "Citizens should remain in place and wait for further updates," Kodiak police said. No loss of life have been reported so far, however, many media reports highlight the incidents of wall developing cracks in Alaska. Many Alaska residents are moving to safer places since the alert has been issued.