Map showing epicenter of magnitude-4.0 earthquake off the coast of Port Hueneme. The quake is located south of the trace of the Santa Cruz Islands Fault. Notice that although geologists use different names, the Santa Cruz Island, Malibu, and Santa Monica Fault are likely continuous, and potentially capable of a M~7.5 shock, according to Stein. Given their thrust motion, a tsunami could be generated by such a rare but possible quake. Credit: Ross Stein, Temblor.