Field measurements and estimates of temperature, viscosity, gas content, and specific gravity of erupting Hawaiian lavas are assembled largely in tabular form. Hawaiian tholeiitic basalt magmas as they reach the surface have temperatures of 1050°–1200° C, viscosities of 2–4 × 103 poises, and gas contents ranging from 0.5 to 2 weight per cent. Below the level of vesiculation they have a specific gravity of about 2.73. Flows continue in motion to apparent temperatures less than 800°.

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