Fluctuations of water‐level in wells in the Los Angeles basin, California, during five strong earthquakes, 1933–1940

Numerous ground‐water hydrologists have obtained records of water‐level surges in wells during earthquakes and of heightened or lowered levels after those earthquakes. Many of these surges and changes of level are undoubtedly direct effects of the several earthquake‐waves that are recorded on seismographs. Thus, water‐level recorders on observation‐wells promise to afford a means of extending greatly the scope of seismographic records for local areas.