Indiana University seismographs detected North Korea's nuclear blast

Seismographs in Japan and South Korea detected the explosion.
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When North Korea tested a nuclear device this week, the blast was detected as far away as Bloomington.

An Indiana University seismologist says equipment IU operates as part of a Midwestern earthquake-monitoring network detected North Korea's nuclear test. The test was widely condemned, with President Barack Obama calling it a "highly provocative act" that threatens U.S. security and international peace.

IU operates seismographs in a network of about 70 such devices in Indiana, Illinois, Missouri and Kentucky that track the North America continent's seismic activity.

Professor of geological sciences Michael Hamburger says some seismographs in that network detected the North Korean blast around 10:10 p.m. Monday, about 13 minutes after the nuclear device was detonated.

He says the IU experiment picked up a P-wave signal from the explosion at detectors in Missouri. That explosion was equivalent to a magnitude 5.1 earthquake.

Monday's nuclear test in North Korea is the authoritarian communist nation's third to date.

North Korea says its nuclear test Tuesday was its "first response" to American threats and warns it will continue with unspecified "second and third measures of greater intensity" if the United States maintains its "hostility."

The test was condemned worldwide, with the European Union saying it poses a threat to regional and international peace. The body also said the move defied UN Security Council resolutions, which was echoed by other countries.

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