. >> they determined using excellerateom ters. you will have near field effect, the easy way to explain it, if you were standing next to a rail road track. the train makes sound and generates and the sound waves tumble. the same thing happens with an earthquake. those /tkpwraupbd waves tumble upon themselves and increase the intensity of the shaking. it's called near field effect. we probably won't get that on the haward fault, but on the san andreas fault. they will have very pronounced shaking. we will also have more interaction because of poor soils that interact with earthquake waves. you can have a moderately distant waves and it will be higher in the bay area and people don't realize how much of the city has been filled. there's a tremendous amount filled in and in those areas, the ground will shake dramatically harder. there's a lot of interaction that plays into the interaction of the intensity. >> this map was adopted by the state of california after its study of the areas that are potentially liquifiable. they are wet ar