<simpleType name="geophysicalMethodEnumType">
  <annotation>
    <documentation>A controlled list of terms identifying supported field geophysical survey methods.</documentation>
  </annotation>
  <restriction base="string">
    <enumeration value="borehole crosshole seismic">
      <annotation>
        <documentation>borehole crosshole seismic - borehole crosshole seismic value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="borehole image log">
      <annotation>
        <documentation>borehole image log - borehole image log value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="borehole seismic downhole source">
      <annotation>
        <documentation>borehole seismic downhole source - borehole seismic downhole source value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="borehole seismic surface source">
      <annotation>
        <documentation>borehole seismic surface source - borehole seismic surface source value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="electrical resistivity tomography (ERT)">
      <annotation>
        <documentation>electrical resistivity tomography (ERT) - electrical resistivity tomography ert value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="electromagnetic induction (EMI)">
      <annotation>
        <documentation>electromagnetic induction (EMI) - electromagnetic induction emi value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="frequency domain reflectometry (FDR)">
      <annotation>
        <documentation>frequency domain reflectometry (FDR) - frequency domain reflectometry fdr value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="gamma-gamma density">
      <annotation>
        <documentation>gamma-gamma density - gamma gamma density value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="gamma ray spectrosocpy">
      <annotation>
        <documentation>gamma ray spectrosocpy - gamma ray spectrosocpy value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="gravity, absolute">
      <annotation>
        <documentation>gravity, absolute - gravity absolute value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="gravity, relative">
      <annotation>
        <documentation>gravity, relative - gravity relative value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="ground penetrating radar">
      <annotation>
        <documentation>ground penetrating radar - ground penetrating radar value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="induced polarization">
      <annotation>
        <documentation>induced polarization - induced polarization value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="magnetic resonance sounding (MRS)">
      <annotation>
        <documentation>magnetic resonance sounding (MRS) - magnetic resonance sounding mrs value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="magnetometry">
      <annotation>
        <documentation>magnetometry - magnetometry value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="magnetotelluric (MT)">
      <annotation>
        <documentation>magnetotelluric (MT) - magnetotelluric mt value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="marine seismic">
      <annotation>
        <documentation>marine seismic - marine seismic value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="microtremor array measurement (MAM)">
      <annotation>
        <documentation>microtremor array measurement (MAM) - microtremor array measurement mam value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="multichannel analysis of surface waves (MASW)">
      <annotation>
        <documentation>multichannel analysis of surface waves (MASW) - multichannel analysis of surface waves masw value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="natural gamma radiation">
      <annotation>
        <documentation>natural gamma radiation - natural gamma radiation value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="neutron logging">
      <annotation>
        <documentation>neutron logging - neutron logging value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="passive seismic (HVSR)">
      <annotation>
        <documentation>passive seismic (HVSR) - passive seismic hvsr value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="refraction microtremor (ReMi)">
      <annotation>
        <documentation>refraction microtremor (ReMi) - refraction microtremor re mi value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="seismic reflection">
      <annotation>
        <documentation>seismic reflection - seismic reflection value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="seismic refraction">
      <annotation>
        <documentation>seismic refraction - seismic refraction value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="self-potential">
      <annotation>
        <documentation>self-potential - self potential value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="spectral analysis of surface waves (SASW)">
      <annotation>
        <documentation>spectral analysis of surface waves (SASW) - spectral analysis of surface waves sasw value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="time-domain reflectometry (TDR)">
      <annotation>
        <documentation>time-domain reflectometry (TDR) - time domain reflectometry tdr value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="transient electromagnetics (TEM)">
      <annotation>
        <documentation>transient electromagnetics (TEM) - transient electromagnetics tem value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="vertical electrical sounding (VES)">
      <annotation>
        <documentation>vertical electrical sounding (VES) - vertical electrical sounding ves value.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="very low frequency method (VLF)">
      <annotation>
        <documentation>very low frequency method (VLF) - very low frequency method vlf value.</documentation>
      </annotation>
    </enumeration>
  </restriction>
</simpleType>