Lightning inside Calbuco’s eruption cloud

The eruption above Puerto Montt — Carolina Barría Kemp
Event image. Carolina Barría Kemp’s photograph of the actual 22 April 2015 eruption from Puerto Montt, released on Flickr under CC BY-SA 2.0 and reviewed by Commons in August 2015. Native 4000 × 2248 JPEG retained byte-for-byte. The source’s camera timestamp is 17:41, which precedes GVP’s reported 18:04 onset; that clock and its time zone have not been authenticated, so the image is not placed earlier in a precise event sequence. Camera: Canon PowerShot SX50 HS, 1/250 second at f/4.5, ISO 80. This is a ground camera view, not a satellite composite.
CC BY-SA 2.0 · original publisher JPEG retained without changes
· Original image source · Image licence

A towering cloud rose over southern Chile, then lit up with electrical activity. Watch the camera operators’ original film, compare three actual eruption photographs and follow how researchers combined lightning detections, satellite views and deposits on the ground.

World: Earth
Location: Chile
Case date or period: 22–23 April 2015 · film published 14 June

Two eruptive pulses, separate observations

Calbuco’s April 2015 eruption provides an unusually well documented meeting of dramatic camera imagery and measurable atmospheric effects. The Smithsonian Global Volcanism Program attributes its chronology to Chile’s OVDAS-SERNAGEOMIN monitoring service: an explosive pulse began at 18:04 local time on 22 April, followed by stronger activity around 01:00 local time on 23 April. The second episode lasted about six hours. These are separate phases of one eruption sequence, rather than a single flash extended by a film edit. The monitoring account also records evacuations and ashfall affecting roads and bridges. A camera view of the plume therefore belongs within a wider, documented volcanic emergency.

A film made by the camera operators

The original Timestorm Films publication credits Martin Heck and Jonas Dengler. Its description identifies both time-lapse photography and actual Sony A7s video, with additional camera equipment listed by the publisher. The 14 June 2015 upload date describes publication, not the date of the eruption. The short finished film consequently contains genuine event imagery presented through an edited sequence of different recording methods. A fast-growing column in a time-lapse cannot supply its physical growth rate without the underlying capture interval. Lightning visible across an edited nighttime sequence likewise cannot be counted as a continuous real-time record. The publisher player preserves the credited publication; its availability does not grant permission to rehost the film.

Three photographs, three clock histories

Diego López’s photograph is dated 22 April; its description associates the first pulse with 18:11 local time, without authenticating an exact camera timestamp. Its Commons transfer happened a year later. Carolina Barría Kemp photographed the eruption over Puerto Montt with a Canon PowerShot SX50 HS. Her source camera clock reads 17:41, earlier than the monitoring account’s 18:04 onset; its time base has not been authenticated. A separate Puerto Varas view is supplied and credited by Commons contributor Aeveraal, with a same-day upload but no verified camera time. These are distinct photographs of the actual column, not three synchronized measurements. Their differing viewpoints can be explored without forcing them into an invented second-by-second sequence. None is presented as a still from the filmmakers’ recording or a photograph of a measured electrical discharge.

Satellite cameras provide another viewpoint

NASA’s Earth Observatory published instrument-specific views acquired on 23 April. Terra MODIS recorded the extensive plume at 14:20 UTC, and Aqua MODIS acquired another view at 18:35 UTC. The second image covers a wider region, which matters when comparing apparent plume size. Suomi NPP also supplied nighttime observations. These products offer a distinct view of the eruption cloud after the onset, rather than a duplicate ground photograph. Their stated instrument and acquisition times make them useful context for the camera sequence, although they do not identify the second at which an individual flash in the film occurred.

Lightning as a scientific measurement

Alexa Van Eaton and colleagues combined GOES-13 cloud observations, World Wide Lightning Location Network detections and field mapping in their 2016 investigation. They reported 93 detected lightning strokes during the first explosive phase and 1,016 during the second. Those are network detections, not a tally of every discharge or a frame-by-frame count from the film. Their analysis distinguishes the northward motion of much of the lightning from the northeastward dispersal of the main fall deposits. Plume modelling suggests an important role for ice at high altitude; a later increase in nearby lightning was interpreted alongside possible ground-hugging currents. These mechanisms remain attributed interpretations supported by several kinds of observations.

Different measurements answer different questions

NASA’s subsequent sulfur-dioxide account describes Ozone Monitoring Instrument observations from Aura spanning 23–26 April. The colored swaths represent atmospheric column measurements, with clear areas outside that day’s coverage; they are not a visible photograph of colored gas. This distinction also applies to the eruption’s lightning story. Ground camera images establish appearance, satellite imagery describes the cloud, and a radio network supplies electrical detections. None alone provides a complete reconstruction. Comparing their clocks and coverage is the route to a stronger explanation, while leaving gaps explicit. Here the original film, three camera photographs and scientific measurements remain separate evidence types. The Atlas marker identifies the known volcano, not an unverified camera position or individual lightning discharge.