Author Archives: Julian Lozos

Our Seismologist Explains Why Bernal’s Chert Is Better Than Soft Rock During an Earthquake

In pretty much every earthquake post that has appeared on this blog, I have extolled the virtues of Bernal’s beloved red chert because it doesn’t shake all that hard even during really big seismic events — especially compared to the … Continue reading

Posted in Bernal Hill, Geology, Geology and Seismology | 25 Comments

Our Seismologist Explains Why the 1906 Earthquake Did Little Damage to Bernalwood

As we noted earlier, today is the 105th anniversary of the Great Earthquake of 1906 — the infamous M7.8 rupture along the San Andreas Fault that severely damaged San Francisco before subsequent fires did the rest of the work destroying … Continue reading

Posted in Geology, Geology and Seismology, History | 6 Comments

New Earthquake Zoning Maps Should Not Rattle Bernal Heights

Last week, the California Geological Survey released its latest set of fault zoning maps. These divide the state into a rectangular grid, with the parts of the grid containing active faults marked in red. Unsurprisingly, there’s a lot of red … Continue reading

Posted in Geology, Geology and Seismology | 6 Comments