Symptoms of UVH will depend on the cause of the problem. Symptoms can come. on suddenly or slowly, can be mild or severe, or may last for a few days or even. weeks. The most common symptoms include: ï· Dizziness or vertigo (described as a spinning sensation) ï· Poor balance, especially with head turns.
Positive-tilt Trough. An upper level system which is tilted to the east with increasing latitude (i.e., from southwest to northeast). A positive-tilt trough often is a sign of a weakening weather system, and generally is less likely to result in severe weather than a negative-tilt trough if all other factors are equal.
Tiltmeter: works like a carpenter's level, and measures vertical movement along a fault. Creep meter: Measures movement along a slip-strike fault, so it measures horizontal movement along a fault. Laser ranging device: detects changes in distance to a reflector. Basically, it's a device that bounces beams off a reflector to detect fault movements. GPS satellite system: Uses a network of Earth-orbiting satellites and measures tiny vertical/horizontal movements of markers set u on the opposite sides of a fault.