Yes, many deserts, if not most deserts, have fault lines in the rocks that lie below them.
Two one in the north runs through the middle of the island and the same in the south
A large number of cities are built in earthquake zones on or near fault lines. Earthquakes can create nice deep harbours, hills with nice views and other topography to make a good place to build a city (San Francisco is good example). There are far too many cities to list here but many of the cities that have coastline on the Pacific ocean have fault lines nearby....
Yes, Louisiana does have fault lines, but they are not as active or known as the fault lines in other states like California. The most significant fault line in Louisiana is the Baton Rouge Fault System, which has been associated with minor seismic activity in the past.
FAULT LINES - These are lines that is prone to earthquakes just like in the Pacific Ring Of Fire it is the ring like line in the Pacific Ocean which involves many active volcanoes
Yes, Turkey is crisscrossed by several fault lines due to its location at the boundary of the Eurasian, African, and Arabian tectonic plates. The North Anatolian Fault and the East Anatolian Fault are two of the major fault lines in Turkey that are responsible for frequent seismic activity in the region.
Yes, there are faults under many, if not all, deserts.
Due to this, many people are afraid of a major earthquake along Marikina Fault. Thankfully, PHIVOLCS drew maps of Marikina Fault, which shows where the fault lines are. Based on a PHIVOLCS documents, Marikina Fault passes through Laguna, Muntinlupa City, Quezon City, Montalban (Rodriguez) Marikina City, San Mateo, Pasig City and Taguig City.
There are fault lines in those areas, and when the earth's plates move, they cause earthquakes. There are two fault lines in San Francisco, but I do not know how much in Japan.
Infinitely many.
Japan is located on top of very active fault lines.
An infinite number of lines can pass through a point.