Global markets reflect worry about rising interest rates for eurozone's weakest nations and possibility of a US recession. Among global markets to tumble most: Germany, down 5.3 percent and France, down 4.7 percent.
Stock prices slide more than 1 percent in Japan, South Korea, and Hong Kong. Investors expect stock prices to go lower, analyst says.
Monday's explosion – the latest in a series of hard-line moves by Pyongyang – may have been 20 times more powerful than its last test in 2006.