![]() ![]() For the 3.2 to 1.8 Ma Koolau Volcano on Oahu, the downward rate of advance of the weathering front varies from 0.004 to 0.041 m/ka. Prior knowledge about the subsurface from well, outcrop, and MASW profiles may greatly aid modeling in some cases. LWP thicknesses may be estimated from the fundamental mode equation or through forward models. LWP thicknesses determined from HVSR provide good agreement with multi-channel analysis of surface waves (MASW) profiles, well logs and outcrop. This natural laboratory is employed to assess the utility of the HVSR (horizontal/vertical spectral ratio) method to characterize the shear-wave velocity ( V s) structure of LWPs, particularly the depth to the contact between saprolite and basalt bedrock. The Hawaiian Islands make an excellent natural laboratory for examining the tropical CZ, where the bedrock composition (basalt) is nearly uniform and rainfall varies greatly. Lateritic weathering profiles (LWPs) are widespread in the tropics and comprise an important component of the Critical Zone (CZ). ![]()
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