The great San Andreas and San Jacinto fault systems somehow merge in the deep, sediment-filled Salton trough. The size and year of historical earthquake ruptures are shown in blue.

The great San Andreas and San Jacinto fault systems somehow merge in the deep, sediment-filled Salton trough. The size and year of historical earthquake ruptures are shown in blue.

The great San Andreas and San Jacinto fault systems somehow merge in the deep, sediment-filled Salton trough. The size and year of historical earthquake ruptures are shown in blue.