What are secondary effects?
What are secondary effects?
Secondary effects means reasonably foreseeable indi- rect effects caused by an action or project later in time or farther removed in distance, including induced changes in the pattern of land use, population density, or growth rate and related effects on the human environment.
What are secondary earthquakes called?
Aftershock: An earthquake that occurs after a “mainshock” (or larger earthquake). Aftershocks occur in the same general region as the “mainshock” and result from readjustments of stress at places along the fault zone. For great earthquakes (M=8), aftershocks may occur over hundreds of kilometres.
Where do seismic waves travel slowest and fastest?
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.
What is a normal P wave?
The P wave is the first positive deflection on the ECG. It represents atrial depolarisation. Normal duration: < 0.12 s (< 120ms or 3 small squares)
What does a small P wave indicate?
The P wave indicates atrial depolarization. At times, the P waves can be buried at the end of the QRS complex, causing a “short RP” scenario, as seen in atrioventricular reentrant tachycardia, or AVNRT.
How do I know if I have junctional tachycardia?
Symptoms can include:
- A racing or fluttering heart.
- Shortness of breath.
- Sweating.
- Headache.
- Dizziness or lightheadedness.
- Fainting.
Why are there no P waves in atrial fibrillation?
Because the atrial rate is so fast, and the action potentials produced are of such low amplitude, P waves will not be seen on the ECG in patients with atrial fibrillation.
Why are there no P waves?
The shadow zone is the area of the earth from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves. The shadow zone results from S waves being stopped entirely by the liquid core and P waves being bent (refracted) by the liquid core.
Where do the P wave velocities abruptly change?
Velocities slow in the region just above the core-mantle boundary (the D” layer or “ultra-low-velocity zone”). S-waves do not pass through the outer part of the core. P-wave velocities increase dramatically at the boundary between the liquid outer core and the solid inner core.