Last week new lava vents opened in the Kīlauea volcano’s eastern rift zone, with fissures destroying a number of homes in the Leilani Estates subdivision of the island of Hawai‘i’s Puna District. Here are some maps.
The Washington Post’s coverage is typically first rate, its maps providing both detailed coverage and context: start there. More detailed maps come from the Kīlauea section of the USGS’s Volcano Hazards Program website, with fissure maps of the entire eastern rift zone (see above) and thermal maps of the Leilani Estates fissures receiving daily or near-daily updates.
The eruption was preceded and accompanied by a number of earthquakes; NOAA has created an animated map showing the incidence, magnitude and depth of the earthquakes that took place during the week of the eruption.
On the WMS Facebook group, Bert Johnson had this to say about this latest profile: “Hers is a standout story, but I wish some of these journalists who keep running these would spend some time and effort discussing some of the other women—known and unknown—who made contributions and helped open the doors of cartography to women.”
Macrostrat’s interactive geologic map covers the world with geologic map data aggregated from diverse sources; clicking on a location brings up more detailed information about said location. [Maps Mania]
The York Museum Gardens’ Geological Mosaic Map is a four-metre-square pebble mosaic that depicts the Yorkshire part of William Smith’s 1815 geological map of Great Britain—a copy of which is held at the adjacent Yorkshire Museum. The mosaic was commissioned in 2015 and created by mosaic artist Janette Ireland, who “used many imaginative devices—including fossils, both real and formed from pebbles, discarded stone from the minster and tiny millstones made of millstone grit—to represent the ideas which Smith was demonstrating in his map. […] The pebbles in the mosaic reflect the colours Smith used in his map, but genuine Yorkshire rocks are displayed in the flower beds on either side of the mosaic, alongside strips of the pebbles used to represent them.” Photo gallery. [WMS]
Science fiction/fantasy novelist Alex Acks, a geologist by training, has some issues with Middle-earth’s mountain ranges. “Middle-earth’s got 99 problems, and mountains are basically 98 of them.” Basically it comes down to how Tolkien’s mountain ranges intersect at right angles—and mountains don’t do that.
And Mordor? Oh, I don’t even want to talk about Mordor.
Tectonic plates don’t tend to collide at neat right angles, let alone in some configuration as to create a nearly perfect box of mountains in the middle of a continent. […]
To be fair to J.R.R. Tolkien, while continental drift was a theory making headway in the world of geology from 1910 onwards, plate tectonics didn’t arrive on the scene until the mid-50s, and then it took a little while to become accepted science. (Though goodness, plate tectonics came down—I have it on good authority from geologists who were alive and in school at the time that it was like the holy light of understanding shining forth. Suddenly, so many things made sense.) Fantasy maps drawn after the 1960s don’t get even that overly generous pass.
And here I thought Tolkien’s mountains were better than most—but then I’m no geologist, and also than most may not be saying that much.
The PBDB Navigator is a map-based interface to the Paleobiology Database, which among other things includes the locations of every fossil find. A map of every fossil site seems straightforward enough, but there are hidden depths to this one: you can filter by taxonomy (want to look up the fossil sites for eurypterids or tyrannosaurs? no problem!) or by geologic period, but what’s especially neat is that you can factor in continental drift: when searching by geologic period (the Permian, for example), you can show the continents as they were positioned during that period (see above). More at Popular Mechanics. [Leventhal]
The Smithonian’s Earthquakes, Eruptions and Emissions interactive map “is a time-lapse animation of volcanic eruptions and earthquakes since 1960. It also shows volcanic gas emissions (sulfur dioxide, SO2) since 1978 — the first year satellites were available to provide global monitoring of SO2.” [Axis Maps]
This short profile of Marie Tharp — the third I’ve seen this year — is notable in that it’s at JSTOR Daily, and links to two of the research papers she co-authored with Bruce Heezen (both of which appear free to access, but require a JSTOR account). Direct links here and here. [WMS]
Another profile of ocean cartographer Marie Tharp, this time from Smithsonian.com’s Erin Blakemore. As Blakemore recounts, Tharp crunched and mapped the sonar sounding data collected by her collaborator, Bruce Heezen; her calculations revealed a huge valley in the middle of a ridge in the North Atlantic seafloor.
“When I showed what I found to Bruce,” she recalled, “he groaned and said ‘It cannot be. It looks too much like continental drift.’ … Bruce initially dismissed my interpretation of the profiles as ‘girl talk’.” It took almost a year for Heezen to believe her, despite a growing amount of evidence and her meticulous checking and re-checking of her work. He only changed his mind when evidence of earthquakes beneath the rift valley she had found was discovered—and when it became clear that the rift extended up and down the entire Atlantic. Today, it is considered Earth’s largest physical feature.
When Heezen—who published the work and took credit for it—announced his findings in 1956, it was no less than a seismic event in geology. But Tharp, like many other women scientists of her day, was shunted to the background.
I really ought to get to Hali Felt’s 2012 biography of Tharp, Soundings: The Story of the Remarkable Woman Who Mapped the Ocean Floor, at some point. Amazon (Kindle), iBooks.