![]() | | Ambae volcano erupts through its crater lake in 2018. Photo from Phys.org |
VANUATU'S ISLAND OF AMBAE is the focus this week's Volcano Watch, written by U.S. Geological Survey Hawaiian Volcano Observatory scientists and affiliates. This edition looks into the observations and impacts of the 2017–2018 Ambae, Vanuatu eruption:
The Pacific is home to dozens of active volcanic systems including the massive Hawaiian shield volcanoes Kīlauea and Mauna Loa. Most basaltic shield volcanoes in the Pacific are related to the hotspots that created the Hawaiian Islands and many of the Polynesian and Micronesian island chains.
These massive hotspot shield volcanoes are built largely by eruptions of lava that are periodically interrupted by cycles of explosive activity. There are other large shield volcanoes found along subduction zones rimming the Pacific Ocean, but they can behave very differently from Kīlauea and Mauna Loa.
The island of Ambae, in Vanuatu, is a large basaltic shield volcano that lies along the subduction zone between Fiji and Papua New Guinea in the South Pacific. Since 1995, Ambae has experienced explosive episodes once or more per decade. In physical form, Ambae looks like a smaller version of Mauna Loa. The island is 9 miles (14 km) wide and 24 miles (39 km) across (see figure) with gentle slopes and dense vegetation. Like Mauna Loa, the summit has more than one large crater.
The craters at Ambae are filled with colorful lake water which testifies to a deep system of heated, sulfur-rich groundwater beneath the summit. At Ambae, these large crater lakes and associated groundwater contribute to a specific style of activity called phreatic or phreatomagmatic eruptions.
Ambae had two strong episodes of moderate to large explosive eruptions in 2017–2018 after mostly minor activity during the previous decade. The first episode occurred in October 2017 and covered the island with ash, gas, and acid rain causing crop damage, water fouling, and respiratory concerns. These impacts, compounded by a lack of new rainfall to replace affected drinking water, forced the evacuation of about 11,000 residents beginning in late 2017. Eruptive activity waned shortly after, which prompted the local population to begin to return to the island around the start of the new year.
Eruptions and their impacts in Vanuatu are monitored by the Vanuatu Meteorology and Geohazards Department (VMGD) using transmitted seismograph (ground shaking) data and periodic island site visits by volcano scientists. After the first episode, low-level volcanic activity continued with minor gas and ash discharge from the volcano. Remobilized ash also turned into mudflow lahars throughout the rainy season, from October to April.
In July and August 2018, VMGD and a New Zealand-based research team arrived at Ambae to collect ash and water samples, acquire seismograph and acoustic (sound) data, and document the impacts of the eruptions. By coincidence, the field teams and local residents were met by new and increasing explosive eruptions. The largest of these eruptions produced ash plumes over 9,100 meters (30,000 ft) above sea level which affected South Pacific airplane traffic.![]() | Ambae Island is in the northern Vanuatu archipelago (Figure A, courtesy of NASA) and hosts a nested caldera at its summit. A temporary seismic-acoustic array was deployed beginning July 2018 (yellow squares). Local airports are marked by the red squares. An example record of an eruption sequence is shown in Figure B, courtesy of Iseul Park, GNS Science. The seismic (black) and acoustic (blue) records compare the data from several eruptions on Aug. 21, 2018 (VUT Time Zone). The eruptions forced the full evacuation of Ambae (Figure C) to neighboring islands of Maewo and Esperitu Santo. Photo courtesy of Graham Leonard, GNS Science, taken on Aug. 18, 2018 |
The newly deployed seismic-acoustic array captured most of the second phase of eruption and these data were subsequently analyzed by researchers from New Zealand, Vanuatu, and the United States. The data showed in detail the timing and size of explosions on the volcano. An example time record for one of the eruptions is shown in the figure which documents a previously unrecognized event. The data show not only the ground shaking from the eruption but also the sounds of the volcano. At present, monitoring in Vanuatu is ably conducted by real-time observation of transmitted seismic data to the remote monitoring center in the capital of Port Vila. Acoustic observation of Vanuatu volcanoes is in its infancy, but the temporary deployment illustrates the value of such data for monitoring purposes.
The new eruption phase ultimately forced the second full evacuation of Ambae in August 2018. Interestingly, while the 2018 eruption on the Island of Hawai‘i received global attention, the Ambae eruption had a larger global impact due to the huge amount of gas released. Fortunately, the eruption ended later that year and local Ambae residents were able to return safely to their homes. In late September 2019, scientists returned to Ambae to remove the temporary seismic and acoustic stations. Local farmers, who had returned earlier in the year reported abundant crops, possibly a result of the newly rejuvenated ash-rich soils.
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Free Book Exchanges, at laundromats in Ocean View and Nāʻālehu, provided by Friends of the Kaʻū Libraries. Open to all. Keep the books, pass them on to other readers, or return them. Selection of books replenished weekly at both sites. ![]() Read Report on Public Input about Disaster Recovery from damage during the 2018 Kīlauea eruption.
View the Civic Engagement and Comment Analysis Report at rb.gy/awu65k.
Learn About Hawaiʻi's History & Culture through Papakilo Database, papakilodatabase.com.
Virtual Workshops on Hawaiʻi's Legislative Processes through Public Access Room. Sign up by contacting (808) 587-0478 or par@capitol.hawaii.gov. Ask questions and discuss all things legislative in a non-partisan environment. Attend Coffee Hour with PAR: Fridays at 3 p.m. on Zoom, meeting ID 990 4865 9652 or click zoom.us/j/99048659652. PAR staff will be available to answer questions and to discuss the legislative process. Anyone wanting to listen in without taking part in discussions is welcome. Learn more at lrb.hawaii.gov/public-access-room.![]() ![]() ![]() Kaʻū COFFEE MILL & VISITOR CENTER. Buy online at kaucoffeemill.com and in person at 96-2694 Wood Valley Road, daily, 9 a.m. to 3 p.m.
PUNALUʻU BAKESHOP online at bakeshophawaii.com and in-person 8:30 a.m. to 5 p.m., seven days a week in x.
ALIʻI HAWAIʻI HULA HANDS COFFEE. Order by calling 928-0608 or emailing alihhhcoffee@yahoo.com.
AIKANE PLANTATION COFFEE COMPANY. Order online at aikaneplantation.com. Call 808-927-2252
MIRANDA'S FARMS KAʻŪ COFFEE. Order online at mirandafarms.com or, in person at 73-7136 Mamalahoa Hwy. See latest print edition at kaucalendar.com..
KUAHIWI RANCH STORE, in person. Shop weekdays, 10 a.m. to 5 p.m., Sunday, 11 am to 3 p.m. at 95-5520 Hwy 11. Locally processed grass-fed beef, live meat chickens, and feed for cattle, goats, sheep, chickens, horses, dogs, and pigs. Call 929-7333 of 938-1625, email kaohi@kuahiwiranch.com.![]() DEPRESSED, ANXIOUS, NEED SOMEONE TO TALK TO? Call Department of Health's expanded Hawai‘i C.A.R.E.S. program at 1-800-753-6879 – the same number previously used by Crisis Line of Hawai‘i. Individuals in crisis can also text ALOHA to 741741, available 24/7.
LEARN SELF-CARE THROUGH Big Island Substance Abuse Council's Practice Self-Care Series. For additional series that feature refreshing wellness tips, follow the Behavioral Health & Homelessness Statewide Unified Response Group at facebook.com/bhhsurg![]() WOMEN'S COLLECTIVE OFFERS HEALTH PROGRAMS. Piko focuses on reproductive health; increasing access, respect, cultural competence, education, and choice. Pilina aims to grow membership and establish a culture of collaborative decision-making. Follow @kau_womens_health_collective. Contact rootsmedieshawaii@gmail.com. Call 808-450-0498.
YOGA WITH EMILY Catey Weiss, Mondays, Wednesdays, and Fridays, 8 a.m. to 9 a.m. at Volcano Art Center Niʻaulani Campus in Volcano Village. Advanced registration required; $5 per class. volcanoartcenter.org/events, 967-8222.
CHOOSE ALOHA FOR HOME is available to families, to provide a healthy way to grow together using neuroscience and positive psychology. Program uses a series of self-guided videos, activities, and "dinner table discussion topics." Sign up at chooselovemovement.org/choose-love-home.
EDUCATION
Register for Boys & Girls Club Mobile Outreach and Tutoring Programs at rb.gy/o1o2hy. For keiki grades 1-6. Contact Boys & Girls Club of the Big Island Administrative Office, Monday through Friday, 9 a.m. to 5 p.m., at (808) 961-5536 or email mobiletutoring@bgcbi.org or info@bgcbi.org.
ʻOhana Help Desk offers online How-To Guides for Chromebooks and iPads at rb.gy/8er9wm. ʻOhana Help Desk also available by phone, weekdays, 7 a.m. to 8 p.m., Sundays from 4 p.m. to 8 p.m.
Invite Park Rangers to Virtually Visit Classes, through connecting with teachers and home-schoolers with distance learning programs and virtual huakaʻi (field trips). Contact havo_education@nps.gov.
Public Libraries are open for WiFi, pick-up, and other services. Nāʻālehu open Monday and Wednesday, 9 a.m. to 4 p.m., Friday, 11 a.m. to 4 p.m. Pāhala open Tuesday, noon to 7 p.m., Thursday, 9 a.m. to 4 p.m., limited entry into library with Wiki Visits. Schedule a Library Take Out time at picktime.com/hspls. Open for library card account help and reference assistance from the front door. WiFi available to anyone with a library card, from each library parking lot. See librarieshawaii.org. Online Directory at shopbigisland.com, co-sponsored by County of Hawai‘i, has a signup sheet for local businesses to fill in the blanks. The only requirement is a physical address on this island.
COMMUNITY
Food Assistance: Apply for The Volcano School of Arts & Sciences COVID-19 Family Relief Funds. Funded by Volcano Community Association, and members of the VSAS Friends and Governing Boards, who have donated, the fund supplies KTA or Dimple Cheek Gift Cards, or gift cards to other locally owned business, to VSAS families in need. Contact Kim Miller at 985-8537, kmiller@volcanoschool.net. Contributions to the fund can be sent in by check to: VSAS, PO Box 845, Volcano, HI 96785 – write Relief Fund in the memo. See volcanoschool.net
ENROLL CHILDREN, from first through eighth grade, in Kula ʻAmakihi, a program from Volcano School of the Arts & Sciences. It started Aug. 3. Call 808-985- 9800 or visit www.volcanoschool.net.
![]() WALK THROUGH A GUIDED NATURE TRAIL & Sculpture Garden, Mondays, 9:30 a.m. at Volcano Art Center Niʻaulani Campus in Volcano Village. No reservations for five or fewer – limited to ten people. Free; donations appreciated. Email programs@volcanoartcenter.org. Garden is open to walk through at one's own pace, 10 a.m. to 4 p.m. weekdays. www.volcanoartcenter.org. Call 967-8222.
KAʻŪ ART GALLERY is open Wednesdays and Saturdays from 9 a.m. - 3 p.m. in Nāʻālehu. It features and sells works by local artists and offers other gift items.Vendor applications are being accepted for its Holiday Arts & Crafts Sale on Saturday, Nov. 13. Kaʻū Art Gallery's website has 24/7 access online and is frequently updated to show current inventory items. "We are always looking to collaborate with local artists in our community," said assistant Alexandra Kaupu. Artists with an interest in being featured at Kaʻū Art Gallery and Gift Shop, contact gallery owner and director Corrine Kaupu at kauartgallery@hawaiiantel.biz.
GOLF & MEMBERSHIPS for Discovery Harbour Golf Course and its Clubhouse: The Club offers Social Memberships, with future use of the clubhouse and current use of the pickleball courts as well as walking and running on specified areas of the golf course before 8 a.m. and after 3 p.m. to enjoy the panoramiocean views. Golf memberships range from unlimited play for the avid golfer to casual play options. Membership is required to play and practice golf on the course. All golf memberships include Social Membership amenities. Membership fees are designed to help underwrite programs and improvements to the facilities.Call 808-731-5122 or stop by the Clubhouse during business hours, 8 a.m. to 4 p.m. daily at 94-1581 Kaulua Circle. Email clubatdiscoveryharbour@gmail.com. See The Club at Discovery Harbour Facebook page.
ALOHA FRIDAY MARKETPLACE, hosted by Kaʻū Main Street, is from 9 a.m. to 2 p.m., grounds of The Old Shirakawa Estate in Waiʻohinu. It features: Made in Hawai'i Products, Organic Produce, Creative Crafts, ARt, Flower and Plants, Food, Ka`u Coffee, Gluen Free Low Carb Goodies, Wellness Services and Products, Clothing, Hand Crafted Treats, Music and more. Vendor and customer inquiries: AlohaFridayMarket@gmail.com.
VOLCANO FARMERS MARKET, Cooper Center, Volcano Village on Sundays. 6 a.m. to 10 a.m., with much local produce, baked goods, food to go, island beef and Hawai‘i Coffee. Cooper Center's EBT Machine, used at the Farmer's Market, is out of service until further notice. EBT is used for Supplemental Nutrition Assistance Program, formerly Food Stamps. Call 808-967-7800.
OCEAN VIEW COMMUNITY MARKET, open Saturdays and Thursdays, 6:30 a.m. to 2 p.m., on the corner of Kona Drive and Highway 11, where Thai Grindz is located. Managed by Mark Council. Masks mandatory. 100-person limit, social distancing required. Gate unlocked for vendors at 5:30 a.m., $15 dollars, no reservations needed. Parking in upper lot only. Vendors must provide own sanitizer. Food vendor permits required. Carpooling encouraged.
O KAʻŪ KĀKOU MARKET, in Nāʻālehu, open Wednesday, and Saturday, 8 a.m. to noon. Limit of 50 customers per hour, 20 vendor booths, with 20 feet of space between vendors. Masks and hand sanitizing required, social distancing enforced. Contact Sue Barnett, OKK Market Manager, at 808-345-9374 (voice or text) or kaufarmer@aol.com for more and to apply to vend. See facebook.com/OKauKakouMarket.
OCEAN VIEW SWAP MEET is open at Ocean View makai shopping center, near Mālama Market. Hours for patrons are 8 a.m. to 3 p.m. Saturday and Sunday. Vendor set-up time is 5 a.m. Masks required.
BUY LOCAL GIFTS ONLINE, IN-PERSON ![]() VOLCANO ART CENTER ONLINE, in person. Shop at Niʻaulani Campus in Volcano Village, Monday through Friday, 10 a.m. to 4 p.m. Gallery in Hawaiʻi Volcanoes National Park, open Wednesday through Sunday, 9 a.m. to 4 p.m. Virtual Shopping Appointments offered via Skype or FaceTime. Book at volcanoartcenter.org/shop for $5. Shop online gallery 24/7. Orders shipped or free local pickup available. See the VAC Virtual Classroom, which features over 90 videos. See volcanoartcenter.org/events, call 967-8222.![]() ![]()
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