I am very interested in learning the geology and earthquake-related significance of the area we live in. This file contains my notes, however haphazard they are. I will eventtually sort them for better organization. First, here are the main links to the more important sites...

 

Home Quake Safety Toolkit - How many of us have actually purchased a kit like this? I bet zero! Let's shop around, compare, and all of us try to buy them in bulk to save money .

Recent Northern California Quakes (map) I felt that 3.4 quake Wednesday morning 3-1-06. It was a sharp jolt in a vertical motion, like a truck had hit my house. It was very fast.

I did not feel the 2.9 one after that.

Recent Statewide Quakes (text)

Real-time Forecast of Earthquake Hazard in the Next 24 Hours

Earthquake Hazard Map for Richmond/San Pablo: Scenario: North Hayward Segment of the Hayward-Rodgers Creek Fault System
Geology notes

 

Road closures graphic obtained from http://www.abag.ca.gov/bayarea/eqmaps/eqtrans/haym_rslt.html

Article on Reduced Quake Risk Discovered

 

We are in area H2 of the Northern Hayward (HN) Fault Subsystem. USGS Database of Potential Sources for Earthquakes Larger Than Magnitude 6 in Northern California.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The San Francisco Bay region lies on the boundary zone between two of the tectonic plates that make up the Earth’s outer shell. The relentless motion of these plates builds up strain that will eventually be released in earthquakes on the region’s many faults. Map above shows the northwestward movement of the Farallon Islands relative to Columbia in eastern California, as documented by Global Positioning System (GPS) data from those two sites. The lengths of fault that slipped in the 1868 Hayward and 1989 Loma Prieta magnitude 6.9 earthquakes areshown in yellow.

 

 

We are between the Northern Hayward Fault and the Wildcat Canyon Fault, also next to the Mulholland syncline.

 

Our Pleistocene-era "ancient deposit" bedrock consists of landslide deposits of sheared claystone and minor sandstone.

 

Geologists have labeled our area as LhF and consists of Los Osos Clay Loam with 30-50% slopes. Formed in material weathered from clay loams from interbedded sedimenttary rock on uplands. I have seen 3 specific terms for our soil : Alo clay, Lodo clay and Mulholland loam. I don't know yet which one we are on.