The eruption of Ilopango volcano on or about 535 CE was one of the largest eruptions of the last 10,000 years and may have impacted human development and societies, not just in Mesoamerica, but also worldwide. Ilopango volcano is located in central El Salvador in an area that was Ch'orti' Maya until the post Classic era (~850 CE). After introducing the impact of the volcanic eruption, this blog post will bring to light the impact of the eruption on local communities and how they responded to it, based on place name analysis. It will also describe the evidence that the Maya created the outlet river on the east side of the volcanic lake.
Lake Ilopango and its north rim, by Jorobeq at Wikipedia [GFDL or CC-BY-SA-3.0], via Wikimedia Commons
Ilopango volcano now has a scenic 8 kilometer by 11 kilometer lake in the middle. It is 450 meters above sea level and is located twelve kilometers east of downtown San Salvador. The rim or lip is 100 to 500 meters above the surface of the lake.
The Ilopango eruption is rated as a 6.9 on the 8 point volcanic eruption scale. This rating is likely to go well above 7 as more research is done on the impact of Ilopango. There have been eight level 7 eruptions throughout the world since 10,000 BCE. It is estimated that 84 kmᶾ of tephra (rock, lava, ash, etc.) was produced in the eruption.
Radiocarbon dating of plant life related to the eruption indicates an eruption between 410 and 535 CE. A more recent carbon dating provides the dates of 450 to 545 CE. There was extremely cold weather globally in 535 and 536 CE most likely caused by a tropical volcanic eruption. Ilopango is the most likely one to fit the weather event.
The extreme weather of 535-536 CE was recorded by the Romans and the Chinese and consisted of cloudy and cool weather, famines, and crop failures. Ice cores in Greenland and Antarctica also indicate a 536 CE cooling event. The 535-536 CE cold weather event resulted in millions of deaths from famine due to failed crops. Some view it as the precipitating event of the Dark Ages in Europe.
One impact of the Ilopango eruption on Mesoamerica hinged on the impact of the eruption on Chalchuapa, one of the primary Ch'orti' coordinating bases, which maintained close contact with Copan, Tikal, and Teotihuacan. Chalchuapa would have helped to coordinate resettlement efforts, with people likely moving north into Chalatenango, Santa Ana, and southwest Honduras. Lenca elites from eastern El Salvador may have moved to Copan.
Chalchuapa may have been right on the border of communities that needed to be re-located due to the ash. It is about 70 kilometers west-northwest of Ilopango. The much closer community of Joya de Ceren reestablished residency sometime before it was buried in a local lava flow in about 590 CE. Joya de Ceren is 35 kilometers northwest of Ilopango.
If Chalchuapa was displaced or severely weakened, it could help explain why Tikal was defeated in 562 CE by Calakmul and Caracol, leading to the 120-year hiatus in monument construction at Tikal. Teotihuacan began to decline in the mid 6th century and suffered a drought. The drought may have been part of the global 535-536 CE climate event caused by Ilopango. The beginning of its decline might relate to Chalchuapa's distracted status as well.
The Story of the Ilopango Eruption from the Local Place Names
The place names around Lago Ilopango tell the story of the eruption and its aftermath. Some names are from the time of the eruption, others are a little bit later, and some are quite a bit later.
East of the volcano, most, but not all, of the Ch'orti' names from the time of the eruption are rather calm and descriptive, indicating that the fiery blast might have been slightly less to the east. Izcanales, about 20 kilometers away, describes the nighttime scene: ix k'an ahl ehtz, which means "time of observing yellow movement." Closer to the volcano is Santa Cruz Michapa, about five kilometers to the northeast. Michapa is mi ch'a' bah and means "cat bodies horizontal." Cats is a clear reference to Maya and horizontal bodies indicates cadavers.
Santa Maria Ostuma, a municipal seat, is 12 kilometers southeast of the volcano. It is also referred to as Ostumac, which is os tuh mak in Ch'orti', or "stink from inside of enclosure." [Click to enlarge map.]
One of the more interesting names is San Emigdio, a municipal seat four kilometers east of the lake. It is an example of a Maya name that sounded like a Spanish phrase, a saint's name. But it originally was a Ch'orti' name: san ehm ik' ti' and means "descent after swelling air at mouth." It describes the blast of air from the mouth of the volcano and then a crater, a descent, being created. It sounds as if this is a description by a survivor, although that seems improbable this close to the volcano.
About seven kilometers southwest of San Emigdio are two Tepezontes towns, San Miguel Tepezontes, about three kilometers from the lake and San Juan Tepezontes, about six kilometers from the lake. Tepezontes is tep ehtz on tech and means "observe the previous hard opening." This seems to be a person observing the crater where previously a volcanic peak had been.
Further west, on the southwest side of the lake, one begins to see the reports of injured people. These names were likely named by rescuers coming to the area quickly following the eruption from points further west like Zapotitan valley, Huizucar, and the Balsam range. Panchimilama is about four kilometers from the southwest edge of the lake. Panchimilama is pan ch'i'h mi lah mah and means "big one breaking open, cats tired, bad condition." "Cats" is a colloquial term for Maya population. It is amazing that only four kilometers from the lake, the rescuers found people alive.
Olocuilta is ten kilometers from the lake, in the same direction as Panchimilama. Here too the rescuers found survivors. Olocuilta is hor lok' wil t'a' and means "escape flying material from crest." The "crest" is a reference to the volcanic eruption. Large volcanic eruptions emit hot flying matter. A couple kilometers from Olocuilta is the town of Cupinco, which is k'ur bin k'o and means "worry about points of the peak." This name has a meaning very similar to Olocuilta and indicates that in this area, flying rocks or points were a major concern during the eruption. Perhaps the people hid in caves and rock shelters or behind large rocks.
About four kilomters southeast of Ololcuilta is Cuyultitan, which is k'o yul ti' tan and means "ash coming from stinky mouth." There the big concern was the tremendous amount of ash falling down.
Two names to the west of the lake indicate that rescuers found only dead bodies and might be an indicator that the immediate violent force of the eruption was felt more to the west and southwest than to the other sides of the lake. Shaltipa is about four kilometers northwest of Panchimilama and is about two kilometers from the lake. Shaltipa is ch'a'ar ti' bah and means "horizontal bodies from mouth." "Mouth" refers to the mouth of the volcano. "Horizontal bodies" would seem to indicate dead persons.
Then there is the name Ilopango itself. It seems to originally have referred to the village, now municipal seat, of Ilopango, rather than the volcano or lake. Ilopango, the village, would have been located about three or four kilometers from the lake. Ilopango is il lo'ob pan k'o and means "see the slackness from breaking open of peak." "Slackness" is a little vague but could mean death and in this context seems likely. Rescuers saw the slack bodies here. Later, probably in colonial times, the name Ilopango was attached to the lake and volcano.
The village (now city) of Soyapango shares the last half of the name of Ilopango, the part that means "breaking open of peak." The front half is soy yah and means "bent and in pain." The rescuers found people with broken limbs or doubled over in sickness and pain from the eruption. Soyapango is about eight kilometers from the edge of the lake.
Santiago Texacuangos is a municipal seat two kilometers northwest of Shaltipa and about five kilometers from the lake. Texacuangos is tech' sak wa'an k'o os and means "rising white from opening up of filling inside peak" and seems to indicate the large smoke or ash cloud rising from the volcano.
In the weeks or months following the eruption, many other villages were named in relation to the eruption, especially the ash. A common name related to the ash is Copinol: k'op bin noh hol - "ponder picking up large amount of crest." "Crest" is somewhat vague but previously it was used to describe the volcano or eruption. Crest is also used to describe the plume of a hat, somewhat similar to an erupting volcano, so it could mean "ash" here. There are three places named Copinol in El Salvador and they are all east of the volcano. One Copinol is a kilometer south of San Emigdio, quite close to the lake. A second Copinol is near San Rafael Cedros, about 15 kilometers northeast of the lake. A third Copinol is located in San Vicente a couple kilometers west of the Puente Cuscatlan bridge over the Lempa River. It is about 40 kilometers east of the lake.
Another name that refers to the ash from the eruption is Tepetitan, located about 20 kilometers east of the lake. It is tep eht ti' tan and means "challenge of ash from opening of the hard one."
Northwest of the lake 10 kilometers is Malacoff or mar ak' k'op, meaning "picking up covering from open space." While "covering" is vague, given the closeness to the lake it seems plausible to refer to ash. Also, the syllable meaning "open space" also means "lake," which would make the whole phrase "picking up covering from the lake," which would be more clearly a reference to the volcanic eruption.
Eight miles west of the lake is the village of Chaltepe or ch'a'al te' pehr, which means "drag horizontal trees." This seems to indicate that the eruption knocked trees down and that later the people had to drag the downed trees out of the way.
Many years later several places at the edge of the lake were named. On the west shore of the lake, near the entry road from Ilopango is Amatitan or ah mat ti' tan, which is "the wrapping around of the ash mouth." This describes the shore all the way around the lake. In fact, Amatitan might have been the Ch'orti' name for the lake.
Going clockwise around the lake, the next place name is Apulo or ah pul lo' and means "the up-and-down of the slack (water)." When used to describe water, the Ch'orti' usually said "slack" for stagnant water. The rest of this name reinforces the notion that the lake was stagnant and had no outlet, thus significantly rising and falling due to rainy and dry seasons and rainier and drier periods.
The next place name along the lakeshore is about six kilometers east of Apulo: Gulushapa is k'ur lux cha' bah in Ch'orti' and means "two points swimming bodies." Gulushapa is a beach bounded by two protruding points. At the northeast corner of the lake is Cujuapa, a narrow bay. Cujuapa is k'ur wahp ha' and means "point of water continuing," nearly a perfect description.
Creating an Outlet River
The Rio Desagüe, the egress river out of Lake Ilopango [Click to enlarge.]
The Rio Desagüe, seen left in its first kilometer from the lake, drains into the Jiboa River which then goes south into the Pacific Ocean. The river does not appear natural and the names in the area support the idea that the Maya created the river by blasting a channel using gunpowder, something they did on a much smaller scale at Lago Güija 8000 years earlier.
The egress river valley a couple kilometers further east (downstream).
Evidence for a human-made egress river include a lip around all of the volcano, with the exception of the egress river, that is 100 to 500 meters taller than the lake. It seems strange that in the process of the lip being created during the eruption that there was a break in the lip. In addition, the egress river runs through a steep valley that is 120 to 160 meters tall in the first three kilometers leaving the lake. It is impossible that the river could have cut this valley in the 1500 years since the eruption. If the river is natural it likely existed prior to the eruption. This may be true from the lip down to the Jiboa, but highly unlikely from the lip in toward the lake, since the eruption would have blasted away much material from the lip inward.
The egress river valley south wall, one to two kilometers from Lake Ilopango, showing scarring.
The meaning of the Jiboa River suggests that Jiboa was also the name of the egress river. Jiboa is jihp po' ha' in Ch'orti' and means "lightning from deep hole river" or "lightning in water from deep hole." Lightning could describe the erupting volcano at night, but it is much more descriptive of a gunpowder blast to create the egress river.
Across the valley from the previous image, on the north side of the egress river valley, also showing significant scarring.
Santa Cruz Analquito is a municipal seat about six kilometers east of the lake and only one kilometer south of the egress river. Analquito is ahn ahl k'it' tob and means "time of pressing pod into current." Pod is a common description by the Maya of the natural container used to explode gunpowder charges under water. Combined with Jiboa, Analquito is very strong evidence for the creation of the outlet river using gunpowder.
The Lake Ilopango egress river (foreground) meets the Jiboa River descending from the top of the image and together they descend to the right (south).
There might have been a second place where the Jiboa River was opened. At the point where the egress river meets the Jiboa River, left, there may have been a lake, with flow toward the ocean blocked. Place name evidence comes from Paraiso de Osorio, a municipal seat. Osorio is os sor ri and means "beside the scraping fittings." Fittings (os) is a common word used by the Maya for explosives. For example, it is seen in Polorós and Anamorós, where the Maya practiced blasting.
Another view of the junction of the egress river and Jiboa River, looking north. This view shows a possible lake bed. [Click to enlarge.]
The word "beside" in a name usually means in close proximity. Paraiso de Osorio is located one kilometer from the Jiboa River and about four kilometers south of the egress river. Its name seems more likely to refer to the Jiboa River, indicating a second possible blasting location.
Looking south along the Jiboa River valley at a possible location of blasting to open the valley. Paraiso de Osorio is located to the right.
Why would the Maya go to the trouble of blasting open an egress river? One reason might have been to improve the water quality in Lake Ilopango, whether used for drinking, recreation, or agriculture. But a more important reason was probably to prevent flooding.
The lip around the lake is lower east of the lake and west of the lake. To the west, near Ilopango, the lip rises to approximately 620 meters. To the east by the egress river, the ridges rise to a height of 640 meters. This indicates, assuming there was no egress river, that as the water level in the lake rose higher and higher, it would have threatened to spill over the western lip and flood the area that is now the San Salvador metropolitan area and was likely at that time, heavily populated.
The Ilopango eruption was a tragedy on a local level that may have had regional and global ramifications. The Maya responded with rescue teams and contemplated how to get rid of deep ash. Many communities were displaced by the ash for a generation or two. Much later, to keep a key population center from flooding, the Maya likely used gunpowder to blast open an egress river to drain the lake and keep it at a more constant lake level. The Desagüe and Jiboa Rivers together may be one local example of Maya civil engineering expertise.