On the Making of Islands

Page 27

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eas, we can see that the presence of limestone aggregate larger “During the Second World War, Japanese garrisons modified caves for fortification, and stragglers took refuge in caves following the liberation. Live ordinance remains in many.� 16

Even beyond the last century, the military digs tunnels and widens caves to store munitions. I visited a commercial storage facility built into a serpentine canyon on the island of Oahu, Hawaii, converted from a Navy munitions storage facility dating to the Second World War. These bunkers contained phenomenal acoustic properties, stretching some 80 yards deep into soft limestone. Under natural geologic processes, the presence of small caves will often lead to larger phreatic chambers—voids formed by groundwater. The military has accelerated the production of phreatic chambers which usually form gradually as limestone decomposes. Voids of aircraft hangars deep below the surface, carved out of the rock to protect expensive aircraft from super typhoons sweeping the Western Pacific, are now the greatest risk for geologic stability of the island. My team has collected measurements which suggest that microfaults are continually forming beneath the jet noise barrier due to the partial collapse of these chambers. In order to understand how this new rock formation will behave as a stratum in the earth, I have collected samples. The purpose of these samples is to gauge the degree to which carbonic acid (produced by the presence of carbon dioxide in ground runoff) will induce separation of the calcium bonds in the limestone. In the core samples taken from the test ar-

than 600 microns at over 75% density, with a factor of entrained air twice as large as standard concrete. For the stability consequences of the structure, please refer to the forensic engineering report.

Conclusion The hollowness of the rock beneath the jet noise barrier will produce further fracturing and collapse. For this reason we must consider the region around the jet noise barrier to be unstable for permanent development. In order to reclaim the barrier for civilian use, construction must be able to accommodate slippage along faults by up to 10 meters. The National Park Service must consider that military development has resulted in a state of perpetual fracture. The concrete-limestone complex will return to the soil of Guam and become nearly indistinguishable in less than 70 years, aside from the remaining fragments of reinforcing bar which will disintegrate hastily in the moist tropical environment. Entropic forces, however, are not self-propelled but require the input of energy. Lacking a force to fully eradicate the land-form, it will progressively merge with the natural features of the island. We can imagine leading school buses of children to observe a road cut revealing the strata of various epochs: Eocene, Oligocene, late Miocene, Pliocene, Pleistocene, and finally, now within the Holocene, the Military Lamina.


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