Analysis of information sources in references of the Wikipedia article "قنبلة القيصر" in Arabic language version.
Despite being exploded in the atmosphere, it generated substantial seismic signals. According to a bulletin of the U.S. Geological Survey it had seismic magnitude mb = 5.0 to 5.25. … from fireball radius scaling laws, one would expect the fireball to reach down and engulf the ground … In fact, the shock wave reaches the ground … and bounces upward, striking the bottom of the fireball, preventing actual contact with the ground.
Despite being exploded in the atmosphere, it generated substantial seismic signals. According to a bulletin of the U.S. Geological Survey it had seismic magnitude mb = 5.0 to 5.25. … from fireball radius scaling laws, one would expect the fireball to reach down and engulf the ground … In fact, the shock wave reaches the ground … and bounces upward, striking the bottom of the fireball, preventing actual contact with the ground.