Why are there so many small, fractured thrust faults near Los Angeles? What does this mean in terms of earthquake probability for this city?

The blind thurst faults of Los Angeles and San Andreas are formed due to the movement of the two tectonic plates the North American and Pacific plate. These two tectonic plates or the crust of the earth did not colloid but slide past each other and formed the fault that is present in San Andreas and Los Angeles.

Los Angeles is at high risk or more chance of earthquakes as these faults, formed due to the activity of plate tectonic, released energy by their rapid movement on active faults.

81 is a composite number.