When in Peru, do what the tourists do, right? Well, most tourists aren’t on the tail end of a several week intensive geology short course on ore deposits and mines of Chile and Peru I guess… but I still had to do it. Machu Picchu is considered one of the 7 Wonders of the World, and it is consistently on the top of any travel’s list. While the unprecedented preservation of the Inca culture’s architectural icon is mostly a lure on itself, there is a neat geological underpinning to this lost city. This blog post is about the rocks that make the famous stones of Machu Picchu and the geologically unstable faults that bound the city ruins! Plus, a list of other spectacular Inca sites that are definitely worth the visit while in the Cusco and Lima areas of Peru.

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Machu Picchu, Peru
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Overlooking the mountains at Machu Picchu, Peru
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Location of Machu Picchu, Peru

Faults and Stones:

Machu Picchu is located high in the Peruvian mountains. The underlying rocks are ~ 246 million year old granite (Lancelot et al., 1978), with local dykes of bright-green serpentine that outcrops along the Inca trail. The well-developed crystals within the granite (derived from its slow-cooling history as a magma) makes it an ideal rock for carving, hammer and making monumental Inca cities out of! The craftsmanship of the Incas was so good that the stones of granite fit together without any cement or binding agent.

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Perfectly-fit granite stones used for building Machu Picchu, Peru

The lost city of Machu Picchu is positioned between two large mountains known as Huayna Picchu and Cerro “montaña” Machu Picchu (both of which are great 1 – 3 hour day hike from Machu Picchu that gives you stunning views of the city). The position where the Machu Picchu is in-between these two taller mountains in a large down-dropped block of the mountain-side known as a graben. This is because there exists two parallel faults proximal to the two surrounding mountains, and seismic activity has lead to the wedge-like subsidence of the block where Machu Picchu is located (Carlotto et al., 1999; Carlotto and Cárdenas, 2001; Vilímek et al., 2006).

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Cartoon of the down-dropped “graben” and faults that bound the Machu Picchu site.
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Machu Picchu between the two mountains “Machu Pichu Cerro” and “Huayna Picchu”. Note the elevation where Machu Picchu city ruins are!

The Incas were smart though, and appeared to have constructed the granite-stoned building and walls in such a way to withstand seismic activity! The region isn’t extremely seismically active, but historical there have been earthquakes in the region near Cusco (USGS, 2015).

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Temple of the three windows (note the perfectly-fit granite blocks) – Machu Picchu, Peru
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Overlooking Machu Picchu city ruins from the Machu Picchu Cerro “montaña” side

Other Inca ruins around Cusco and Lima

Outside of Machu Picchu, there are plenty of other Inca ruins that are well-worth a visit. These include Moray, Sal Minas, Ollyamtambo, Pisac, Sacsayhuaman, Valley de Sur, and Pachacamac:

Moray (Cusco region)

  • Spectacular circular Inca agricultural sites. The surrounding landscape is made of salty evaporate rocks, so these circular depressions are sinkholes caused by the dissolution of soluble rocks. The Incas utilized these depressions in the landscape and sculpted stunning symmetrical circular agricultural terraces where growing temperature vary up to 15°C from top-to-bottom!
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Moray circular Inca agricultural terraces – near Cusco, Peru

Sal Minas (Cusco region)

  • Hundreds of salty water pools that, when the water evaporates, residual salt is harvested.
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Sal Minas (salt mines) near Cusco, Peru
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Sal Minas (salt mines) near Cusco, Peru

Ollanyaytambo (Cusco region)

  • An ancient Inca military city with strategically high-built royal buildings and walls overlooking the town.
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Ollyamtambo “Sacred Valley”, near Machu Pichu, Peru
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Ollyamtambo “Sacred Valley”, near Machu Pichu, Peru
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Ollyamtambo “Sacred Valley”, near Machu Pichu, Peru

Pisac (Cusco region)

  • A site of large Inca agricultural terraces northeast of Cusco city.
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Agricultural terraces of Pisac – near Machu Picchu, Peru

Sacsayhuaman (Cusco)

  • One of the best examples outside of Machu Picchu of the wonderfully-carved stonemasonry of the Incas.
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Sacsayhuaman – near Cusco, Peru

Valley de Sur (Cusco region)

  • A pre-Inca historic site with city streets that go on for miles!
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Valley de Sur (south valley) – near Cusco, Peru

Pachacamac (Lima region)

  • Buildings and temples to the sun-god, built before the Inca Empire, but maintained during their reign. These buildings are made out of mud-bricks, and the brick themselves are made of mudstone!
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Pachacamac Inca sun-temple near Lima, Peru
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Mud-bricks (made of mudstone) for the walls of Pachacamac – near Lima, Peru

Final thoughts:

It’s hard to imagine anyone being disappointed in a visit to Machu Picchu. No matter which direction you look, everything is truly awe-inspiring! The Incas were very smart and had an understanding of the geology. They built their lost city in a hidden place, aided by the graben geomorphology, but knew about the seismic activity in the area… thus, they skillfully constructed their buildings with carefully-carved granite in order to withstand small tremors. Machu Picchu fully deserves its spot as a Wonder of the World, and it, along with the many other areas I mentioned, are true testaments to the lost Inca civilization and well-worth traveling to. Cheers!

-Stephanie

Peru, South America, Machu, Picchu, geology, travel, blog, adventure, hiking, exploring, earth, science, rocks, nature, geomorphology, Inca, Andes, mountains, culture, civilization, lost city, city ruins, places to visit, fault, earthquake, granite, Inca trail, what to do, visit, Huayna Picchu, Cerro Machu Picchu, photography, cusco, llama
Llama overlooking Machu Picchu, Peru
Check out my video to go with this blog post.
Peru, South America, Machu, Picchu, geology, travel, blog, adventure, hiking, exploring, earth, science, rocks, nature, geomorphology, Inca, Andes, mountains, culture, civilization, lost city, city ruins, places to visit, fault, earthquake, granite, Inca trail, what to do, visit, Huayna Picchu, Cerro Machu Picchu, photography, cusco, water pool, astronomy
Astronomical water pools – Machu Picchu, Peru
Peru, South America, Machu, Picchu, geology, travel, blog, adventure, hiking, exploring, earth, science, rocks, nature, geomorphology, Inca, Andes, mountains, culture, civilization, lost city, city ruins, places to visit, fault, earthquake, granite, Inca trail, what to do, visit, Huayna Picchu, Cerro Machu Picchu, photography, Cerro Machu Picchu, montaña Machu Picchu, Peru
View from Cerro Machu Picchu (i.e. montaña Machu Picchu), Peru
Peru, South America, Machu, Picchu, geology, travel, blog, adventure, hiking, exploring, earth, science, rocks, nature, geomorphology, Inca, Andes, mountains, culture, civilization, lost city, city ruins, places to visit, fault, earthquake, granite, Inca trail, what to do, visit, Huayna Picchu, Cerro Machu Picchu, photography
The Inca city of Machu Picchu, Peru

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