Assuming these cities are typical, what type of tides are common: on the east coast ? on the west coast ? on the gulf of mexico ?

1. semi-diurnal tide - The U.S. East Coast usually has a semi-diurnal tidal pattern. This means that the coast experiences two highs and two lows of about the same height in a day. It is also called a semi-daily pattern.
2. Mixed semi-diurnal tide - The U.S. West Coast usually has a mixed semi-diurnal tidal pattern. This means that the coast experiences two highs and two lows of in a day, but the height of the tides differ from  each other.
3. Diurnal tide - Areas such as the Gulf of Mexico typically have a diurnal tide. This means that the coast experiences only one high and one low tide in a day.

The answer is magnitude measures the effects of an earthquake on the area , while the intensity measures the strength of an earthquake.