The first reports of a fire at a warehouse in the Binhai New Area
began coming in at around 22:50 local time (14:50 UTC) on 12 August. The
first responders were unable to keep the fire from spreading.
Firefighters who first arrived on the scene proceeded to douse the fire
with water as they were unaware that dangerous chemicals were stored on
the site, thereby setting in motion a series of more violent chemical
reactions.
[13][15]
At around 23:30 (15:30 UTC), the first explosion occurred and
registered as a magnitude 2.3 earthquake, generating seismic shock-waves
energetically equivalent to 3 tonnes of
TNT.
Shortly after, a second more powerful one occurred, causing most of the
damage and injuries with shock-waves felt many kilometres away. The
second explosion generated seismic shock-waves with energy equivalent to
21 tonnes of TNT.
[20] The resulting fireballs reached heights of hundreds of meters.
[21][22][23][24]
Around 11:40 (03:40 UTC) on 15 August, a series of eight smaller
explosions occurred in the port as fire from the original blasts
continued to spread.
[25][26][27]
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To understand just even one single facet of the problem, one of the chemicals stored here that blew up was an explosion of 800 tons of Ammonium Nitrate. This if I understand this correctly was what Timothy McVeigh used to kill 300 people in a Federal Building in Oklahoma in revenge for what happened at the Christian Cult and all the deaths in Waco, Texas around that time too.
So, Ammonium nitrate is extremely explosive under the right conditions but it was surrounded by even worse things for people to survive in the long run which could cause their deaths over time that reacted with water and caused both chain reactions of large and smaller explosions over time. Then when it rained even smaller explosions occurred because these chemicals explode when combined with water in any way.
Here is a more detailed report of what occurred:
The first two explosions occurred within 30 seconds of each other at the facility, which is located in the Binhai New Area of Tianjin, China.[3][4] The second explosion was far larger and involved the detonation of about 800 tonnes of Ammonium Nitrate.[5]
Fires caused by the initial explosions continued to burn uncontrolled
throughout the weekend, repeatedly causing secondary explosions, with
eight additional explosions occurring on Saturday, 15 August, 2015.
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