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The explosion produced a 4.7-magnitude tremor, according to the U.S. Geological Survey. The previous nuclear test registered 3.58 on the Richter scale.
The closest city to the epicenter is however Ahar, a city with a population of 94348 (latest census).
Theoretical intensity calculations are expecting very strong to severe shaking in the epicenter area.
We will start-up an in-depth article as soon as possible.
Orange alert level for shaking-related fatalities. Significant casualties are likely and the disaster is potentially widespread. Past events with this alert level have required a regional or national level response.
Yellow alert level for economic losses. Some damage is possible. Estimated economic losses are less than 1% of GDP of the Islamic Republic of Iran.
Update 13:13 UTC : We have no record of historical earthquakes close to the current epicenter. A 2002 earthquake with a Magnitude of 6.5 at a distance of +300 km from the current epicenter was unfortunately deadly for 227 people. In other words we think this is really a dangerous earthquake. Luckily most people will have been out of their houses at the time of the quake.