The active Rodgers Fault lies to the west of Sonoma Creek; however, the risk of major damage is mitigated by the fact that most of the soils beneath the city consist of a slight alluvial terrace underlain by strongly cemented sedimentary and volcanic rock. To the immediate south, west and east are deeper rich, alluvial soils that support valuable agricultural cultivation. The mountain block to the north rises to 1,200 feet (366 m) and provides an important scenic backdrop, around which views the city's original streetscape was carefully laid out.