Inge Lehmann print
Inge Lehmann (May 13, 1888 – February 21, 1993) was a Danish seismologist who first demonstrated that the Earth's core is not one single molten sphere, but contained an inner (solid) core, in 1936. Earthquake seismologist rely particularly on two types of waves which are generated by large events and travel through the entire planet, and can be recorded with seismometers worldwide: compressional (or primary, P-waves) and shear (or secondary S-waves), which behave differently in solids and liquids, and can be reflected, refracted and transmitted, much like light in different media. She detected some P-waves from a large 1929 New Zealand earthquake, which should have been in the core's 'shadow'. She correctly interpreted this as an indication that they must have bounced off an internal boundary within the liquid (outer) core (see 4 in the orange earth diagram). She published her results in 1936. Her feat of exacting scrutiny and expert interpretation was accepted by her contemporaries, but not really confirmed experimentally till the 1970s.
This is one of 7 prints in the edition. Each is 8" (20.5 cm) square and printed in dark cyan and red-orange ink on white Japanese kozo (mulberry) paper.
Inge Lehmann print
Inge Lehmann (May 13, 1888 – February 21, 1993) was a Danish seismologist who first demonstrated that the Earth's core is not one single molten sphere, but contained an inner (solid) core, in 1936. Earthquake seismologist rely particularly on two types of waves which are generated by large events and travel through the entire planet, and can be recorded with seismometers worldwide: compressional (or primary, P-waves) and shear (or secondary S-waves), which behave differently in solids and liquids, and can be reflected, refracted and transmitted, much like light in different media. She detected some P-waves from a large 1929 New Zealand earthquake, which should have been in the core's 'shadow'. She correctly interpreted this as an indication that they must have bounced off an internal boundary within the liquid (outer) core (see 4 in the orange earth diagram). She published her results in 1936. Her feat of exacting scrutiny and expert interpretation was accepted by her contemporaries, but not really confirmed experimentally till the 1970s.
This is one of 7 prints in the edition. Each is 8" (20.5 cm) square and printed in dark cyan and red-orange ink on white Japanese kozo (mulberry) paper.