Welcome to the 23th Daily Field Note! Here you find the top post of the day, one covering each scientific field that is included by Geopolis. Since these authors put a lot of effort in writing a good post they surely deserve the extra exposure.
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Subjects curated by Geopolis are Geography, Anthropology, Ecology, Geology, Archeology and certain branches of History.
Geology: San Francisco Bay Area Geology: The Hayward Fault Zone
Although over a million people live near this bay, I doubt many of them know what is below their feet besides the most know San Andreas Fault. This fault is furthermore not the only potential danger under the ground, but to know more about that, you should read 
Out of all the regions I've lived in the United States, the San Francisco Bay Area in California is by far my favorite. The rich and complex culture of the bay would appear to be a direct reflection of its dynamic topography. It was in this region that I experienced my first earthquake. As a result, I became infatuated with the geological processes taking place there. While I was always aware of the San Andreas transform boundary, I was surprised to find out the Bay Area is riddled with faults. While most people presume it is the San Andreas Fault that is the most hazardous of this region, there is another fault that poses just as much of a threat.
Archeology: History below us
In most European cities, we are living just above history. Some months ago I was guiding some friends from the United States visiting the city. When I brought them to a 2.000 year old part of the city, or streets with more than 800 years of history they were amazed. I tried to watch my city with their eyes and tried to see their fascination of what is normal for me... for a people in a country that 200 year old things are old, seeing things that are older of your country should amaze you. And they were able to touch stone columns of a roman temple of more than 2000 years old Is like Gaudi's Sagrada Familia... I've been walking by its side for more than 14 years, as it was in the path fr...
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