Overview

sampling methods


Show Summary Details

Quick Reference

Techniques for collecting representative sub-volumes from a large volume of geologic material. The particular sampling method employed depends on the nature of the material being sampled and the kind of information required. Common methods are: (a) random sampling, a non-systematic or haphazard distribution of sampling locations; (b) systematic sampling, a regularly spaced distribution of sampling locations; (c) stratified sampling, a sequentially spaced, vertical distribution of sampling locations based on sampling each stratigraphic unit in a succession; (d) grab sampling, the collection of material using an externally controlled, mechanical grab (a method often used when sampling the sea floor or the surface of another planet); and (e) chip sampling, the collection of borehole drilling chips that are carried to the surface by lubricating mud and are representative of the material traversed by the borehole.

(a) random sampling, a non-systematic or haphazard distribution of sampling locations; (b) systematic sampling, a regularly spaced distribution of sampling locations; (c) stratified sampling, a sequentially spaced, vertical distribution of sampling locations based on sampling each stratigraphic unit in a succession; (d) grab sampling, the collection of material using an externally controlled, mechanical grab (a method often used when sampling the sea floor or the surface of another planet); and (e) chip sampling, the collection of borehole drilling chips that are carried to the surface by lubricating mud and are representative of the material traversed by the borehole.

Subjects: Earth Sciences and Geography.


Reference entries

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.