Earthquakes can be analyzed with the formula: M - M = log A where M is the magnitude of the earthquake (unitless), and A is the seismograph amplitude of the earthquake being measured (m). The magnitude of an earthquake with triple the seismograph amplitude of a magnitude 5.0 earthquake is? 1 Sound intensity can be analyzed with the formula: 12 4-4 10 10 4, where I is the intensity of the sound being measured (W/m), and L is the perceived loudness of the sound (dB). How many times more intense is a 40 dB sound than a 20 dB sound?