Mauna Kea Permafrost Survey, Geophysical Data
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Surveys were conducted at four cinder cones on the Mauna Kea summit plateau, Hawaii.  Subsurface information was generated using two geophysical methods: ground penetrating radar (GPR) and electric resistivity tomography (ERT).  This archive contains unvalidated raw data.


CONTENT
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ERT-Pohaku
	ERT survey at Puu Pohaku (Douglas Cone), Jun 22, 2015 
ERT-Waiau
	ERT survey at Puu Waiau, Jun 23 & 25, 2015
ERT-Wekiu/
	ERT survey at Puu Wekiu (Summit Cone Crater), Jun 23, 2015 & Sep 12, 2016
GPR-Haukea/	
	GPR survey at Puu Hau Kea (Goodrich Cone), Jun 24, 2015 and Sep 13, 2016
GPR-Wekiu/
	GPR survey at Puu Wekiu (Summit Cone Crater), Jun 21, 2015


FILE FORMATS
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GPR - PULSE EKKO P100 from Sensors & Software Inc.
*.HD = header file with general line information
*.DT1 = data file (Pulse Ekko format)
 
ERT - 4point light HP from Lippmann Geophysical Instruments
*.dat header with data, 1st line: name; 2nd line: electrode spacing; 3rd line: array number (1=Wenner, 3=dipoldipol; 4th line: no. of electrodes; fifth line: center of array present, sixth line: ip present (0=no, 1=yes) followed by data points x (m), z (m), rho (ohmm); 0000 indicates data file ends. Data is saved using the data format of the 'Res2DInv' geoelectric inversion program (by GeoTomo software)


REFERENCES
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Context and results are provided in

* Leopold, M., A. Morelli, N. Schorghofer. Subsurface architecture of two tropical alpine desert cinder cones that hold water. Journal of Geophysical Research 121, 1148-1160 (2016). doi:10.1002/2016JF003853
	Lake Waiau lines 3 & 4 were merged to line 'gamma'

* Schorghofer, N., M. Leopold, K. Yoshikawa. State of high-altitude permafrost on tropical Maunakea volcano, Hawaii. Permafrost and Periglacial Processes, in press (2017). doi:10.1002/ppp.1954


CONTACT
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Matthias Leopold (University of Western Australia)