Why do seismic waves speed up?
Seismic waves travel fast, on the order of kilometers per second (km/s). Temperature tends to lower the speed of seismic waves and pressure tends to increase the speed. Pressure increases with depth in Earth because the weight of the rocks above gets larger with increasing depth.
Where do seismic waves travel fastest slowest?
Body waves travel through the body of a planet. Surface waves travel along the surface. There are two types of body waves: P-waves travel fastest and through solids, liquids, and gases; S-waves only travel through solids. Surface waves are the slowest, but they do the most damage in an earthquake.
Where do seismic waves begin?
Seismic waves are usually generated by movements of the Earth’s tectonic plates but may also be caused by explosions, volcanoes and landslides. When an earthquake occurs shockwaves of energy, called seismic waves, are released from the earthquake focus.
What is the other name of L waves?
Also called long wave .
What are P S and L waves?
P waves travel fastest and are the first to arrive from the earthquake. The different S waves arrive after the P waves. The slowest (and latest to arrive on seismograms) are surface waves, such as the L wave. L waves are named for the Cambridge mathematician A.E.H. Love who first described them.
What does a poor R wave mean?
Poor R-wave progression is a common ECG finding that is often inconclusively interpreted as suggestive, but not diagnostic, of anterior myocardial infarction (AMI). An interpretive approach to the ECG with poor R-wave progression is presented that has clinical relevance in the daily treatment of patients.
What is an abnormal R wave progression?
Poor R-wave progression (PRWP) is a common ECG finding that is often inconclusively interpreted as suggestive, but not diagnostic, of anterior myocardial infarction (AMI). PRWP is defined by R wave height ≤ 3 mm in V3.
What is early R wave progression?
Definition. An electrocardiographic finding where the amplitude of the R wave becomes greater than the amplitude of the S wave in the QRS complex at an unusually early point in the precordial leads, usually in leads V1 or V2. (
What is abnormal R wave progression late transition?
Poor or late R-wave progression consists of a transition zone in lead V5 or V6, and it can be a sign of a previous anterior myocardial infarction.