Reflection seismology (or seismic reflection) is a method of exploration geophysics that uses the principles of seismology to estimate the properties of the Earth 's subsurface from reflected seismic waves.arine survey acquisition is not just limited to seismic vessels; it is also possible to lay cables of geophones and hydrophones on the sea bed in a similar way to how cables are used in a land seismic survey, and use a separate source vessel.
Psoriasis typically starts or worsens because of a trigger that you may be able to identify and avoid. Factors that may trigger psoriasis include: 1  Infections, such as strep throat or skin infections. 2  Injury to the skin, such as a cut or scrape, bug bite, or a severe sunburn. 3  Stress. 4  Cold weather. 5  Smoking. 6  Heavy alcohol consumption.
But in conditions like plaque psoriasis, your immune system is not working properly. It can make too much of several proteins, including one called tumor necrosis factor, or TNF. The extra TNF can contribute to skin cells growing too quickly, and causes them to build up.laque psoriasis is a lifelong condition that causes dry, thick, scaly, red skin. About 7.5 million adults in America have psoriasis. Plaque psoriasis is the most common form.