The evening of August 12th about 11:20, the international logistics center of Tianjin port area Ruihai company belongs to dangerous goods warehouse explosion. According to the understanding, the fire process occurred in the two explosion, the interval of about 30 seconds. The first explosion occurred at 23:34 in August 12, 2015, 6 seconds, near the magnitude of ML about 2.3, equivalent to 3 tons of TNT; the second explosion occurred in 30 seconds, the near earthquake magnitude of about 2.9, equivalent to 21 tons TNT. The site has a mushroom cloud rises up to now, as of August 17, 2015, 9, Tianjin port explosion has caused 114 people died, 54 people confirmed the identity of 16 people (including police firefighters, Tianjin port fire 23 people, 5 people, 10 others), not recognized the identity of 70 people, 8 people lost contact with 56 people, Tianjin port fire personnel 6 people, 698 people, but PCB companies in the production process using a large number of chemical. Produce a lot of waste gas, waste water, solid waste gas in the environment. This is no doubt to the usual reserves of a large number of chemicals PCB manufacturers sounded the alarm!
 
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