While you can deprecate the stupidity of the owners and laws to allow this development, 45 years ago the Hawaii Geothermal Project, of which I was a member, selected the site of HGP-A to be on this fault line, a mile or so from Leilani Estates, because that spot was deemed by geophysicists as the optimal point to do the drilling. However, our 3 megawatt well, which, by the way, was then the hottest geothermal find ever, was experimental. Why Puna Geothermal Ventures built their 38 MW facility close by makes some scientific sense, but was that financially and logistically smart?
Island of Hawaii remains open for business. TV channels across the world report on burning homes and lava covering roads, and the Hawaii Visitors' Bureau is concerned that tourists will stop coming. You are at this moment not allowed to enter the Hawaii Volcanoes National Park, and much of the lower Puna area. However, the rest of the island is safe. But what about the whole island falling into the ocean? Won't happen, trust me.
part of the Kohala area dropped into the sea, causing seawaters to rise up the slopes of mountains on Lanai and Molokai to 1500 feet. Only 73,000 years ago a flank of West African Fogo Volcano collapsed into the ocean and the nearby island of Santiago (left) experienced a 560-foot mega-tsunami.
From my book, but extracted from a posting on this site:
A particularly good example is the collapse on Oahu of Koolau Volcano a million years ago (give or take 500,000 years). Known as the Nuuanu Landslide or Nuuanu Debris Avalanche, where an apparent earthquake caused one third of the island to break off and fall into the sea. This might have been the largest landslide in the history of the planet, for just one chunk, known as the Tuscaloosa Seamount, is 20 miles (32 km) by 11 miles (18 km) and just more than one mile (1.8 km) high, and is located 60 miles (96 km) northeast of the Nuuanu Pali at a depth of 8800 feet (2680 m). As you drive towards Kaneohe/Kailua through the Pali or Wilson Tunnels and look back at the mountains, what you are viewing is that inside portion of the volcano that remained, although over the years, there has been considerable erosion and land build-up. A web page by Paul Jokiel of the Hawaii Institute of Marine Biology provides good info (Google search: “Jokiel’s illustrated scientific guide to Kaneohe Bay, Oahu”).
Kenji Satake of the Japan National Institute of Advanced Industrial Science and Technology reconstructed the event and surmised on the resultant tsunami from computer models using digital bathymetric data obtained on cruises commissioned by the Japan Marine Science and Technology Center. Estimated were: volume of 3000 km3 and velocity range from 20 m/s to 100 m/sec. Calculated tsunami heights were 100 meters (328 feet) in north Oahu, but 30 meters (98 feet) on the opposite side of the island, Waikiki. Five hours after the slide, 10-40 meters hit the Pacific Northwest and 30-70 meters in California, and in eight hours, 5-10 meters on the Japanese coast. Satake indicated that the wave heights could well have been double those sizes in the Hawaii Islands. So, a noted scientist did write about the prospects of a mega-tsunami in the far field from a landslide.