Posted June 12, 2019 09:06:04A new report from the U.S. Geological Survey (USGS) finds that there’s been a big increase in the number of earthquakes recorded in the Caspian Sea and the Columbia River Basin since last year.
The report, published today, also finds that the largest quakes recorded in 2016 were all within the North Cascadians and are not unique to the area.
The latest update to the Cissau quake series, released in February, found that the most recent earthquake in the area occurred on March 8, with a magnitude of 4.5.
The earthquake was felt throughout the Cisaras, and it was the strongest to hit the region since the 1980s.
This time last year, the largest quake recorded was in 2015.
The biggest one to hit a US city since the 1900s, however, was in 1989.
The 2017 earthquake was also the first to occur in the Columbia, but there have been five other quakes in the region in the last 30 years, according to the report.
The most recent quake that occurred in late February was about 1,000 kilometers (620 miles) northwest of Cissac, the report said.
That quake was about 70 kilometers (44 miles) from the Cairns region and was centered about 30 kilometers (19 miles) east of the city of Cairn, the most populated area in the US.
The Cissaus quake was preceded by another, the Cresco quake in early March.
In that quake, the earthquake measured a magnitude 3.7 and had a depth of about 150 meters (660 feet).
The USGS said the earthquake was probably triggered by a hydrothermal vent, a process that happens when water pressure builds up in an underground cavern.
Earthquakes can also be triggered by lightning or by landslides, the agency said.