中源地震

中 = 丨 + 口 : Mnemonic symbol: a dart board, because you always try to hit the center.

Julian Giant Squid (zhu-) is throwing dinosaur bones (丨) as darts on a dart board in front of the engine ((e)ng1). To make it a bit more difficult he's throwing mandarins (口) into the air as well and skewers them up right in the center (中 is a mandarin skewered on a dinosaur bone) in mid flight with the dinosaur bones. He's still able to consistently hit the center (中) of the dart board.

源 = 原 + 氵 : The origin (源) of the H bomb can be traced back to when Yu the Great (yu) once forgot a lot of water bottles (氵) next to her A bomb (原) in the anthill's kitchen (an2) and accidentally detonated the bomb.

地 = 也 + 土 : Dorothy Gale (di) operates the excavator (也) in the space station's bathroom (Ø4) to move a pile of dirt (土) out of the way.

震 = 辰 + 雨 : James II of England (zh) is taking part in a game show. His task is to carry a birthday cake (辰) to the other end of the encampment's bathroom ((e)n4) while it is raining (雨) heavily and an earthquake (震) is shaking (震) James II of England and the cake. James II of England has to take care to cancel out the vibrations caused by the earthquake or his cake will collapse.