{'fraction_non_alphanumeric': 0.013788968824940047, 'fraction_numerical': 0.02577937649880096, 'mean_word_length': 4.835664335664336, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Mapping the Nuuanu and Wailau landslides in Hawaii

The development of concepts about the giant Nuuanu and Wailau landslides have been dependant on bathymetric surveys of the landslide region northeast of Oahu and Molokai. Improved technology of sonar surveying and of navigation through the years has increased the precision of these maps providing more details about the landslides. The landslides were mapped by a U.S. Navy-Scripps Institution single-beam sonar survey in 1953-54, but the resulting map was not of sufficient detail to permit recognition of the landslides. A more detailed U. S. Navy survey in 1958 utilized an improved radio navigation system and provided the bathymetric detail necessary for recognition of the landslides. The GLORIA side-scan sonar surveys during 1986 to 1991 produced an acoustic reflectance image of the seafloor of the entire Hawaiian area and these images clearly revealed the nature and size of the Nuuanu and Wailau landslides and identified an additional 66 landslides longer than 20 km in the Hawaiian region. In early 1998 Simrad multibeam high-resolution surveys utilizing GPS navigation revealed new detail in the proximal parts of the landslides. The 1998 and 1999 JAMSTEC multibeam surveys produced detailed bathymetric maps of the entire landslide area for the first time. In the Nuuanu landslide the exposed volume of the 54 blocks larger than 1 km 3 is 1400 km 3 . Refitting of the blocks back to their apparent pre-slide positions shows that they do not fit easily into the reentrants of the host volcanoes. A pre-landslide seaward-extending bulge in the host volcano flanks could accommodate this excess volume.