海嘯白板動畫

Hand-drawn cross-section diagram of how a tsunami forms, seen from the side: along the bottom the sea floor is split by one slanted fault line, the right block of rock pushed up a step higher than the left block. There is exactly one short red arrow, drawn on the right block next to the fault, pointing straight up; there is no arrow on the left block. Deep blue sea water fills the space above the sea floor. Directly above the fault the sea surface has a low wide bulge. To the right of the bulge one tall wave travels towards the right, with one red arrow above it pointing right. At the far right a sandy beach slopes up out of the water with three small houses and one palm tree on it. Nothing else in the picture. Coloured pencil and watercolour marker, clean black ink outlines, warm off-white paper, no text.