A shallow magnitude 4.1 earthquake was reported just one mile from Temescal, California at 10.09am GMT on Thursday with its epicentre at Trabuco Canyon in California.
And overnight, the US state was rocked again as another earthquake hit, this time 169 miles (272km) east-southeast of Kodiak.
The earthquake measured 4.1 magnitude and was followed by a 3.9 magnitude aftershock one minute later.
While in the Philippines, the mount Mayon volcano continues to spew thick black ash clouds while bright red lava cascades down the mountain’s slopes.
In Japan, the Mount Kusatsu-Shirane volcano triggered a deadly avalanche northwest of Tokyo, killing three and inuring many more.
And a powerful tremor struck off the coast of Indonesia around 6.34am GMT, leaving several buildings in Jakarta swaying in the aftermath.
Two more volcanos in Indonesia, Mount Agung and Mount Sinabung, have been threatening a major volcanic eruption for months now, with Sinabung rearing its ugly head one week ago.
But Prof Chris Elders, a geology expert from Curtin University in Australia, says the recent activity is entirely normal.
He told the BBC: “There’s nothing unusual about what we’re seeing at the moment.
“It just so happens that these events are occurring at the same time in different parts of the region. There’s not necessarily a relationship between them.”
He says volcanic and tectonic activity has occurred in the region for “hundreds and thousands of years”.
“So if you’re just looking at one tiny snapshot in such a long period of time it looks like it’s something special that things are happening all at once, but if you stand back and look at it in the scale of things, you’ll see the action is fairly continuous.”
But volatility on the Pacific Ring of Fire today has increased fears for the Big One: a major earthquake in a highly-populated area on the US west coast.
The map above, shared by the UN Office for Disaster Risk Reduction, shows how the Pacific Ring of Fire stretches around 25,000 miles across the Pacific Ocean.
The disaster experts tweeted the map this afternoon, adding: “Pacific Ring of Fire active today. Philippines: Mayon Volcano erupted, thousands of evacuees. Japan: Volcano causes avalanche, one death.
“Indonesia: 5.3 earthquake jolts Jakarta, buildings swayed. Alaska: 7.9 magnitude earthquake led to tsunami alert.”
The map highlights various trenches across the Ring of Fire caused by moving tectonics plates, which cause earthquakes when they grind together and volcanoes as they move apart.
It is the most geologically active area in the world with more than 90 per cent of earthquakes occurring here, as well as 22 or the 25 biggest volcanic eruptions in history.