How to Read the Display. The seismograms displayed are from a few of the seismograph stations routinely recorded by the Northern California Seismograph Network. Each is a record of how the ground moved at a particular seismograph station in Northern California during a 24-hour period.he height of the recorded waves on the seismogram (wave amplitude) is a greatly magnified representation of the actual ground motion. A recording of an earthquake has recognizable characteristics.
View Full Profile. There are three main causes of retinal detachment, each with its own set of risk factors. The most common type is called a ârhegmatogenousâ detachment, and is caused by a tear or hole in the retina. The retina is the thin, light-sensitive tissue that lines the back inside wall of the eye.
The retina works with the cornea, lens, and other parts of the eye and the brain to produce normal vision. Retinal detachment occurs when the retina separates from the back of the eye. This causes loss of vision that can be partial or total, depending on how much of the retina is detached. Retinal detachment is a medical emergency. When your retina becomes detached, its cells may be deprived of oxygen. See your doctor immediately if you suspect you have retinal detachment. If left untreated or if treatment of retinal detachment is delayed, you risk permanent vision loss.