100 lines
4.0 KiB
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100 lines
4.0 KiB
Plaintext
From fork-admin@xent.com Fri Sep 13 20:45:04 2002
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Fri, 13 Sep 2002 11:38:22 -0700
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To: fork@example.com
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Subject: plate tectonics update
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From: Dave Long <dl@silcom.com>
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Date: Fri, 13 Sep 2002 11:38:21 -0700
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When we were discussing Kuhn, I wrote:
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<http://www.xent.com/pipermail/fork/2001-July/001854.html>
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> My understanding of the history of
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> plate tectonics is that the magnetic
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> reversal patterns encoded in seafloor
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> basalts were crucial supporting data
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> which suddenly became available only
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> after Navy declassification, so the
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> adoption curve may be skewed.
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Many of the essays in Oreskes' _Plate
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Tectonics_ seem to support this idea:
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Sandwell, "Plate Tectonics: A Martian View"
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> In this essay, I'll describe a few of the important confirmations of
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> plate tectonic theory provided by satellites and ships. These tools
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> were largely developed to support the Cold War effort, and many are
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> labeled geodetic since they are used to make precise measurements
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> of the size and shape of the earth and the spatial variations in the
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> pull of gravity. The tools of satellite geodesy are needed for all
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> aspects of global warfare; precise satellite tracking and gravity
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> field development are needed for precision satellite surveillance
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> as well as for targeting ballistic missiles; the global positioning
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> system is used in all aspects of modern warfare; radar altimetery is
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> used or aiming submarine-launched ballistic missiles as well as for
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> inertial navigation when submerged.
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>
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> The global seismic networks were developed, primarily, to monitor
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> underground nuclear tests. Marine magnetometers were developed,
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> primarily, for detection of submarines. Multibeam sea floor mapping
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> systems were developed, primarily, for surveying critical and
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> operational areas of the northern oceans.
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... and the Navy was in no hurry
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to declassify any of these data,
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as any uneven coverage could have
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revealed the parts of the oceans
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they found most interesting.
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-Dave
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(What do our seismic networks say
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about the middle east? I hazily
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recall a story about LA reporters
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asking their local geophysicists
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about an early morning quake, to
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be told that, as far as could be
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figured, the "epicenter" was at a
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negative depth, travelling near
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mach speed, and presumably headed
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towards Edwards)
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