We have just arrived in sunny Americus, GA from the cold north to ramp up for the SUGAR project. The peaceful, pastoral landscapes of southern Georgia mask geological structures created by a series of dramatic events that were central to the formation of the North American continent. During SUGAR, we will use sound waves to image these geological structures. Less than 2 weeks from now, we’ll deploy 1200 small seismographs along a 200-mile-long line that extends from north of Columbus to south of Valdosta with the help of a cadre of students from across Georgia and beyond. These instruments will record sound waves generated by a series of controlled blasts in deep drill holes.
Spanish moss lined trees along our transect south of ValdostaCollecting these data will involve a week of intense work by >30 people. However, just laying the groundwork for this effort has already required a long list of (sometimes novel) tasks. When we conceived of this project, we drew a couple of straight lines on a map that would enable us to capture the geological features that we wish to study: the South Georgia Basin, the Suwanne Suture, and frozen magmas from the huge Central Atlantic Magmatic Province. In reality, we must create this line by knitting together a patchwork of roads. During a couple of planning trips, we bumped along on dirt roads, cruised county lanes, and zoomed down state highways mapping out the best route.
Dan and Steve scouting our route. Our seismometers will line county and state roads across southwestern Georgia, and both seismometers and seismic sources will cross private properties. Identifying private landowners to request permission has transformed us into detectives. In most cases, the name and address of the owner are easily found on the tax assessor's website for each county. But actually getting in touch with people is not so easy! We mailed letters. We put flyers directly into people’s mailboxes. We searched for phone numbers online and left messages (sometimes multiple messages…). We found websites and email addresses for companies, and sometimes wrote to people about our project through website forms (including those for a bank, a dentist's office and a website selling organic beef!). Happily, once we made contact, individuals and companies have been very welcoming and graciously granted us permission – southern hospitality in action! A litany of other preparations have already been completed or are currently underway. Drilling of the holes for seismic sources has just begun, and the seismometers will arrive very soon. We are definitely ready for the transition from preparing to doing....
5 March 2014
If No One's around to See a Landslide, Does It Make a Noise? You Bet. - (Juneau, Alaska) Capital City Weekly
It has been an incredibly busy week. We have had between 42 and 48 people here for the field school, including 35 students and 12 instructors (seven to 10 at a time). The first day was very light for the jet-lagged students, just a short introduction to the field school and some background, and then introductions all around as we started to get to know each other. The final group of nine students finally arrived around 9 p.m. They were the most worn-out, bedraggled bunch of travelers I have ever seen.
After a good night’s sleep we started on the first classroom day. Our full five days near the Brahmaputra River would focus on the river processes and the stratigraphy they produce. We stopped the lectures at 4 and all piled into the bus
to see the embankment built to protect the city of Sirajganj from the westward migrating river. As is often the case in the dry season, they were repairing the embankments from last summer’s collapses. We rented two country boats and sailed along the embankment and walked back to the buses on the top of it. It is an impressive structure, but in need of continual repair to keep up with the river.
The next two days were spent on the river and its mobile islands, called chars. Setting up the equipment for the river surveying was hampered by a lack of power for drilling holes. A Bangladeshi drill and bow solved the problem, but not before rearranging the schedule. On the first day we all visited the char near the 5 km
Bangabandu Bridge over the river. We spent the day viewing sedimentary structures and seeing the villages on this island that is almost entirely underwater during the monsoon. For the second day, we had to split the group. One contingent joined Jim Best as we surveyed the river with an ADCP, which measures water velocities from the top to the bottom of the river, and a sidescan that provides images of the bottom on either side of the boat using sound. The other, yielding to student requests, went to Tangail, the nearest city, for shopping. When everyone returned, we held a cricket match, with most Americans learning the rules on the fly. We finished the five overs per side as darkness fell.
We went back to the classroom the next day for more lectures on remote sensing of changes on the delta, stratigraphy,
subsidence and arsenic contamination. The hands-on experience was analysis of two sets of well samples that had been drilled the days before. Everyone had a chance to describe the samples, measure magnetic susceptibility and use a portable XRF machine to measure chemistry. We have found that magnetic susceptibility and strontium content are a good way to characterize whether sediments have come from the Brahmaputra River or not.
Finally, our last field day here was doing a resistivity imaging survey over the two bore holes and across the boundary between the Brahmaputra floodplain and the upland strata of the Madhupur tract. Generations have debated whether the transition is a fault contact or not. We would collect some data to try to answer the question. The students also got
to visit another tube well being drilled. Tube wells, drilled primarily for drinking water, is a local drilling method whereby a team of a handful of people can drill a 100m well in a day by hand. After everyone helped set up the 750m long resistivity line, most of the American students went to see the tube well drilling. The Bangladeshis, who have all seen tube well drilling, stayed with me to help run the resistivity line. As it turns out, Liz Chamberlain was pulled into a local villager’s home to have her hands tattooed with henna by a woman and her daughters. She missed the tube well drilling, but gained an exciting personal experience. It was also the first time the students were in a Bangladeshi village. We were the center of attention and many photos were snapped by both sides. We gathered up the resistivity equipment and then had informal student
presentations before the final night barbeque. We had successfully completed the first half of the course, and all the students (and instructors) were bonding.
Upon our little spinning rock,
Cosmic rays and debris knock.
Through great fields and waves we race,
Not empty, our broad path through space!
We’re touched, long fingers from afar:
Energy from our bright star.
A fusing, roiling dynamo,
Magnetic fields induced by flow.
Eleven circuits round our wheel,
Her heartbeat’s pulses we can feel.
In search of answers, models run,
Probing rhythms of the sun.
Further reading: Modeling the Solar Dynamo, Science 2013
This is one in a series of poems based on science news, written by Katherine Allen, a researcher in geochemistry and paleoclimate at the Lamont-Doherty Earth Observatory. First posted 4/5/13 on Allen’s website.
Feb. 21 is Language Day in Bangladesh. It is a holiday, now adopted by the UN as International Mother Language Day. It commemorates a day in 1952 when a crowd of Bengali students protesting Pakistan’s adoption of “Urdu and only Urdu as the official language of Pakistan” were fired upon by the police. It marks the beginning of the move towards the independence of East Pakistan, the future Bangladesh, from Pakistan. It is a time of plays, book fairs and poetry reading celebrating the Bengali/Bangla language. There are also laying of flower wreaths at the Shahid Minar, the monument where the killings occurred near Dhaka University, and many smaller copies throughout the country.
For us, it was a travel day. A long eight-hour drive from Khulna in SW Bangladesh across the Ganges River and the Jamuna River, as this section of the Brahmaputra is known, to our home for the next week. The eight of us in our
party left the Bawali in two vans, stopped to pickup equipment, and settled in for a long uneventful drive, or as uneventful as driving in Bangladesh can be.
The next day my group went to Mawlana Bhashani Science and Technology University to try to install a new GPS. After various meetings and cups of tea, we explored the rooftops looking for the perfect site for the antenna. Unfortunately, the building we were in was not quite finished. It was a good site, except the columns on the roof were still a mass of rebar and the concrete was yet to be poured. More meetings, coffee, sweet desserts, and we checked out other roofs. Many buildings at the relatively new university are unfinished. The older finished ones are lower and the clear view of the sky we need is blocked by trees. The
first roof was the best choice, but would not be ready for three months. The best we could do was to set up the GPS box and leave all the equipment there. Humayun will come and finish the job in May. Without the installation work, we continued to meet people and have tea, lunch and more tea. We finally left around 4. Time to go back to the Elenga Resort, where we were staying, and prepare for the arrival of students for the Field School.
Our NSF grant from the PIRE (Partnerships for International Research and Education) has a large emphasis on providing American students with international research experience. One of the things we proposed was a two-week Field School in Bangladesh. We have 15 U.S. students, 15
Bangladeshi, a few other invitees (France, Singapore, India) plus the scientists and students from our project and our advisory board. Most were scheduled to arrive on Sunday. During the day, I started receiving messages about delayed and cancelled flights. My nightmare scenario was arrivals scattered over several days with no way to know where or when. Most of the delays were absorbed by the long layovers at JFK and O’Hare, where experienced Bangladesh hands would lead them to the promised Field School. Our travel agent shifted one of the cancellations to another flight.Then I learned that Steve Goodbred, leader of the JFK troop, had his flight cancelled and would fly a day later. Mike Howe, a grad student with one trip to Bangladesh, was in charge. Worse, the flight was delayed and could miss its connection in
Abu Dhabi. One student was MIA. I stayed up late to follow the flight and, yes, it missed the connection. I went to bed thinking that most of the U.S. students would be a day late.
I awoke early to find that they had been rebooked through Delhi and would arrive late afternoon. Better still, I learned that the missing student had been rebooked to the Chicago route. Then Humayun called and asked if I was meeting the on-time group for breakfast. I rushed out and Babu drove Chris and myself to the Parjatan restaurant across from the Martyr’s memorial. We got there just after they did. We had breakfast and then dodged traffic to cross the street to the memorial. While there, the Dhaka University contingent arrived for breakfast and we joined them. The Field School was on. Three-quarters of the people had arrived; most of the rest would be here by dinner. Only Steve and Ryan would be a day late.
More cuddly than a dino,
The Zanda woolly rhino!
This pioneer of old
Grew shag before the cold.
The high Tibet plateau
Was higher then, you know!
And when the ice expanded,
(with you I will be candid):
They did some procreation
And made a woolly nation!
We still have some Tibetan yak …
But I want that rhino back!
Further reading: Out of Tibet: Pliocene Woolly Rhino Suggests High-Plateau Origin of Ice Age Megaherbivores, Tao Deng et al., Science 2011
This is one in a series of poems based on science news, written by Katherine Allen, a researcher in geochemistry and paleoclimate at the Lamont-Doherty Earth Observatory. First posted 9/2/11 on Allen’s website.
When we got cell phone signal back, we found things did not go according to plan. Scott’s flight had a medical emergency that required a stop in London, so he missed his connection. So did the GPS box, so they both arrived the morning of the 18th. He was not in Khulna already working. He wasn’t working on the compaction site. Between the flight delays and the ship delays, we had lost a day.
Since I couldn’t meet Scott, it was best for me to go to Polder 32 to check on the GPS there. However, not knowing the situation, we had sailed up the wrong channel. We wouldn’t get to the Polder 32 site until the afternoon. Polder is a Dutch term for an embankment. They have been built around much of the land in coastal Bangladesh to protect it from flooding from the brackish water and
improve farming. An unexpected side effect is that the protected land inside the polder, with no flooding or sediments, has sunk by over a meter. It is lower than the land outside the wall and lower than high tide. When Cyclone Aila hit the area in 2009, it breached the polder and the island was flooded for almost two years. We are studying both the physical environment and the human impact. My part is measuring the subsidence with GPS. The receiver here has a modem so the data can be collected by phone, but it hasn’t worked since Jan. 1. We went to the school that houses it, and I managed to correct the problem.
Now it was time to join Scott. I left the boat for a bumpy 2.5-hour drive to Khulna and the hotel. We had allotted two days for servicing and installing GPS in Khulna, but we also wanted to visit a 400-year-old temple in the Sundarbans. It is being looked at to measure subsidence since it was built. We could only visit the temple if we could do the GPS work in one day. We started a 7 a.m., picking up Hafizur and heading to his family’s house, where the compaction meter is. We hoped to finish it quickly, but there were problems with the GPS. The solar panel controller was bad and had to be replaced. Then I found the settings of the GPS were bad; I couldn’t communicate with it. After a struggle, I managed. The system went bad last June and had recorded no data since then. Scott collected data from the compaction meter and surveyed the monuments, while
I got the GPS going again. When it was time to leave, we found that the Islamic family had prepared a huge lunch for us, and we had to stay and eat: sweet rice appetizer, two kinds of fish, chicken, vegetable, rice and a rice pastry in palm juice for dessert.
When we left to go to Khulna University (KU), our chance for the temple looked bleak. We met Professor Rakib Uddin, who did not get our sense of urgency. The GPS at KU hadn’t been working for years. Set up in the Urban Planning Department, the 20-year-old receiver needed constant care to keep going. We had installed these obsolete instruments when we first started working in Bangladesh and had almost no funding. We would be reestablishing the site, replacing everything.
Then we would install a new receiver in Rakib’s office in Environmental Sciences. As long as we had some overlap of the two receivers, we could combine the measurements for a longer record. After various formalities, we went to the office. We would need to buy some extra equipment, but the professor had to leave. We called everyone to say we could not do the temple. Then Rakib got the professor to leave the key so we could keep working. It was now a maybe. We arranged for the forest permits not knowing if we could use them. Allan and Towfique went shopping while Scott and I did what we could. By the time they got back and we finished, with multiple time-stealing problems along the way, it was dark. Rakib stayed late and Scott and I rushed to install the new GPS. The new ones are easier to work with, but
everything takes time. By the time we finished it was almost 9 p.m.
We rushed to the hotel and packed overnight bags. Bachchu’s other boat, the Mowali, would take us to the Bawali. We left at 10 p.m. after less than 24 hours in Khulna. It took 4 hours to reach the Bawali west of Polder 32. It was 2 a.m., but we made it. No dinner, but a chance to see the only Hindu Temple in the Sundarban. With two armed guards for tigers and a local guide, we sailed to a small channel south of the temple and took the launch to go into the forest. The channel got smaller, with branches occasionally sweeping across the boat. We got stuck, but the tide was rising. Then we had a long hike through the muddy forest, across a log bridge and more mud.
Finally we got there. After examining the temple, we decided more work was needed before we accepted the low subsidence rate estimated for the site. We also visited the rubble of the home for the local community and their protective wall. They were sent here to protect the region from Arakan and Portuguese pirates. They were the ones who built the Shakher temple. We could head back down the channel and return to Khulna on the Bawali. Despite all the problems, we had accomplished all of our goals for this part of the trip.