Geological Disasters Exam II October 25, 1999 Choose the best answer for the following: 1. Which rock type contains the highest amount of silica? 1. basalt 4. rhyolite 2. diorite 5. gabbro 3. andesite 2. The tsunami that devastated Hilo, Hawaii on Aprill, 1946 was caused by 1. a lahar in California 4. a typhoon in the Guam 2. a volcanic eruption in Japan 5. a landslide in Washington 3. an earthquake in Alaska 3. A seismograph is used to measure 1. earthquake intensity. 4. wind speed. 2. earthquake magnitude. 5. storm intensity. 3. earthquake velocity. 6. hurricane wind speed. Tsunami waves 1. travel at speeds up to 10 miles per hour. 4. only occur in the Pacific Ocean. 2. are caused by hurricanes and typhoons. 5. travel through the mantle. 3. travel at speeds up to 600 miles per hour. 6. travel through the outer core. 5. The epicenter of an earthquake 1. lies directly below the fault. 4. lies directly below the hypocenter. a:::lies directly over the focus. 5. lies d...