Geophysical investigations were conducted at Las Flores Estancia to better define the structures associated with historic occupation of the site. Field surveys were conducted on February 24 and March 1, 2000, and March 27-28, 2001. Three geophysical techniques were employed: ground penetrating radar (GPR), electromagnetic conductivity (EM), and total magnetic field measurement (MAG).

Geophysical investigations were conducted at four locations within the Pio Pico State Historic Park in Whittier, California. The purpose of the geophysical surveys was to locate and map modern cultural and potential archaeological features for future excavation. Those data could then be integrated with geophysics to produce maps of sensitive archaeological remains to be avoided or excavated prior to park re-development. Field surveys were conducted in March and August, 2001. Three geophysical techniques were employed: ground penetrating radar (GPR), electromagnetic conductivity (EM), and total magnetic field measurement (MAG).