Leukocyte Esterase. Leukocyte esterase is an enzyme present in most white blood cells (WBCs). A few white blood cells are normally present in urine and usually give a negative chemical test result. When the number of WBCs in urine increases significantly, this screening test will become positive.
Land subsidence occurs when large amounts of groundwater have been withdrawn from certain types of rocks, such as fine-grained sediments. The rock compacts because the water is partly responsible for holding the ground up. When the water is withdrawn, the rocks falls in on itself.
He explains that the earthquake caused a significant subsidence in the sea floor, which then rebounded like a drum, creating a huge hump of water.. He says: This was a little unusual because usually after an earthquake you have strong positive vertical motions on the ocean side and land subsidence on the land side.