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.
Any action or event that can disturb the delicate connections of the retina to the layers behind it can cause a retinal detachment. People Who Have Developed Retinal Tearing â A retinal tear is what happens when the retina has a hole in it, due to parts of it being pulled away from the outer layer, or if the retina is twisted in one way or the other. A retinal detachment can start if the vitreous, the gel-like part of the eye, oozes in between the outer layer and the retinal layer, causing them to detach from one another. What Are The Symptoms Of A Detached Retina? Thankfully, detached retinas do have many symptoms.