Induced seismicity in Basel
The largest event prompted concern from local residents. The six borehole seismometers installed near the Basel injection well to monitor the natural background seismicity and the geothermal stimulation recorded more than 13,500 potential events connected with the geothermal project, from which 3,124 were of sufficient quality to permit [hypocenter] determinations in the period 2–12 December 2006, which spanned the main stimulation and the decline in the event rate. During the post-stimulation period from 13 December 2006 onward, a further 350 locatable events were detected up to 2 May 2007, by which time events were occurring sporadically at around one per day. In all, locations for more than 3,500 events were determined.
Frederick S. Lyman
Letters to his brother David Brainerd Lyman (1840–1914) describe a massive eruption of Mauna Loa on their ranch accompanied by a series of earthquakes from March 27 to March 31. His eyewitness observations, sometimes called the "best account" of the events, has been used by scientists for many years.
A few days later the powerful April 2, 1868 Hawaii earthquake, destroyed their house and most others in the area. A massive landslide triggered by the shock killed much of his livestock. From one of the letters:
"It was impossible to stand, we had to sit on the ground, bracing with hands and feet to keep from rolling over. In the midst of it we saw burst out... what we supposed to be an immense river of molten lava (which afterwards proved to be red earth), which rushed down its headlong course and across the plain below, ... swallowing up everything in its way, trees, houses, cattle, horses, goats and men. ... After the hard shaking had ceased, all along the sea-shore the sea was boiling and foaming furiously, all red, for about an eighth of a mile from the shore, and the shore was covered by the sea."
The resulting tsunami killed many of the witnesses who were living at lower elevations. It was the largest earthquake in modern recorded history of the Hawaiian Islands.
This convinced the family to return to town, where he looked for whatever employment he could.