Zealandia Bank | U.S. Geological Survey Official websites use .gov .gov website belongs to an official government organization in the United States. Secure .gov websites use HTTPS lock ( or means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites. Zealandia Bank Find U.S. Volcano Filters The map displays volcanoes, earthquakes, monitoring instruments, and past lava flows. Get Help Earthquake Plots To view an earthquake cross-sectional plot, click "Draw Plot" to start drawing on the map. Once the plot area is selected, click on "View Plot" to view chart or "Clear Plot" to start over. Map Layers Earthquake Colors Earthquake Depth Units Earthquake Time Units Results Filters The map displays volcanoes, earthquakes, monitoring instruments, and past lava flows. Get Help Earthquake Plots To view an earthquake cross-sectional plot, click "Draw Plot" to start drawing on the map. Once the plot area is selected, click on "View Plot" to view chart or "Clear Plot" to start over. Settings Map Layers Earthquake Colors Earthquake Depth Units Earthquake Time Units Map Legend Map Legend Results Zealandia Bank Publications Connect Zealandia Bank consists of two pinnacles about 1 km apart rising from a submerged bank to near the ocean surface between Guguan and Sarigan Islands (Commonwealth of the Northern Mariana Islands). Facts Block Location: Commonwealth of the Northern Mariana Islands Latitude: 16.88° N Longitude: 145.85° E Elevation: 0 (m) 0 (f) Volcano type: Stratovolcano Composition: Basalt / Picro-Basalt, Andesite / Basaltic Andesite Most recent eruption: Unrest in the Holocene Threat Potential: Low* *based on the National Volcano Early Warning System Summary Zealandia Bank consists of two pinnacles about 1 km apart rising from a submerged bank to near the ocean surface between Guguan and Sarigan Islands. One pinnacle reaches more than 1 m above water at low tide. Andesitic rocks were dredged at the southern peak, which showed some evidence of coral growth. Freshly broken pahoehoe basaltic rocks were recovered from 1.7 km depth on the western flank. The age of the most recent eruptive activity is not known, but a NOAA bathymetric survey in 2004 detected fumarolic activity. From the Smithsonian Global Volcanism Program Facts Block Location: Commonwealth of the Northern Mariana Islands Latitude: 16.88° N Longitude: 145.85° E Elevation: 0 (m) 0 (f) Volcano type: Stratovolcano Composition: Basalt / Picro-Basalt, Andesite / Basaltic Andesite Most recent eruption: Unrest in the Holocene Threat Potential: Low* *based on the National Volcano Early Warning System Volcanoes Hazards Program Links Assess Prepare Forecast Activity Products Observatories About Was this page helpful?