Harnessing Thor’s Hammer: Forensic Science Is Unlocking the Mysteries of Fatal Lightning Strikes

Lightning Bolts in Johannesburg, South Africa

Lightning bolts in Johannesburg, South Africa. Credit: Dr. Carina Schumann, Johannesburg Lightning Research Laboratory |
Wits University

Scientists in South African and the UK have found the smoking gun in forensic lightning pathology that could help save lives threatened by the increase in lethal lightning activity due to climate change.

As the world gathers for COP26 in Glasgow, scientists have found the smoking gun in forensic lightning pathology that will help develop life-saving knowledge to address the lethal effects of the increasing number and severity of thunderstorms and lightning strikes due to global climate change.

New research by scientists from South Africa and the UK could help forensic teams understand whether people or animals were the victims of fatal lightning strikes, based solely upon an analysis of their skeletons. Their study is published in the journal Forensic Science International: Synergy, and titled “Harnessing Thor’s Hammer: Experimentally induced lightning trauma to human bone by high impulse current.”

Climate change is increasing and there is evidence to suggest the incidence and severity of thunderstorms and lightning strikes could increase. Sadly, fatal strikes are common on wild animals, livestock, and people – with African countries having some of the highest fatality rates in the world.

In South Africa, more than 250 people are killed annually by lightning, whereas 24, 000 people worldwide die each year. When a lightning death is suspected, the forensic pathologist determines cause of death by looking for signs of lightning-trauma to skin and organs of the deceased. However, when the body is skeletonized, soft tissues are absent and cause of death by lightning cannot be attributed.

This new research provides a tool to investigate cause of death when skeletonized remains are recovered as part of accident or death investigation.

Micro-Trauma and Micro-Fracture Patterns Caused by Experimentally Induced Current

Experimental lightning: Experimental lightning trauma in action. Left image shows bone before current is applied. Middle image is a high-speed capture of the passage of current. Right image is the bone following current passage, with effects of barotrauma showing the splitting apart of bone tissue by internal pressure wave. Credit Nicholas Bacci, School of Anatomical Sciences | Wits University and Hugh Hunt, Johannesburg Lightning Research Laboratory | Wits University

According to Dr. Nicholas Bacci, Lecturer in the School of Anatomical Sciences at Wits University and lead author of the paper, “identifying a fatality caused by lightning strike is usually done though marks left on the skin, or damage to the internal organs – and these tissues don’t survive when bodies decompose. Our work is the first research that identifies unique markers of lightning damage deep within the human skeleton and allows us to recognize lightning when only dry bone survives. This may allow us to recognize accidental death versus homicide in cases where cause is not apparent, whilst at the same time allowing us to build a more complete picture of the true incidence of lightning fatalities.”

The research was undertaken as collaboration between specialists in forensic anthropology, anatomy, lightning physics, and micro-computed tomography (micro-CT) from the University of the Witwatersrand (Wits University) in South Africa, Northumbria University in the UK, and the Nuclear Energy Corporation of South Africa (NECSA).

The researchers generated artificial lightning in the laboratory, which was then applied directly to human bone, extracted from donated cadavers who had died of natural causes.

Dr. Hugh Hunt from the Johannesburg Lightning Research Laboratory (JLRL) at Wits University explains “we used equipment to generate high impulse currents in the lab, (up to 10,000 Amps), which mimicked the effect of lightning passing through the skeleton. Natural lightning can often have significantly higher peak currents but this allowed us to have much greater control over the experiment than trying to somehow place human tissue in the path of a natural lightning strike,” says Hunt, a Senior Lecturer and Head of the JLRL in the School of Electrical and Information Engineering.

What the experiments showed was a pattern of damage to bone that was uniquely caused by short duration lightning current.

Lightning Striking Sentech Tower

Lightning striking the Sentech Tower in Johannesburg, South Africa. Credit: Dr Carina Schumann, Johannesburg Lightning Research Laboratory | Wits University

Senior author Dr. Patrick Randolph-Quinney, Associate Professor from the Forensic Science Research Group at Northumbria University, and the Centre for the Exploration of the Deep Human Journey at Wits University, explains “using high-powered microscopy we were able to see that there is a pattern of micro-fracturing within bone caused by the passage of lightning current. This takes the form of cracks that radiate out from the center of bone cells, or which jump irregularly between clusters of cells. The overall pattern of damage looks very different when compared to other high energy trauma, such as that caused by burning in fire.”

“Even though this experiment was conducted under controlled conditions in the lab, we see the same trauma in animals killed by natural lightning. We were able to compare the human results with bone from a poor giraffe killed by lightning – and the pattern of trauma is identical even though the micro-structure of human bone is different from animal bone. This is the smoking gun that we were looking for in forensic lightning pathology,” he adds.

Micro Trauma and Micro Fracture Patterns Caused by Experimentally Induced Current

Comparative histology: Patterns of micro-trauma and micro-fractures caused by the passage of experimentally induced current in human bone (middle) and a known case of fatal natural lightning strike in a juvenile giraffe (bottom). A control sample (undamaged) is seen in the top panel. Credit: Patrick Randolph-Quinney | Forensic Science Research Group, Northumbria University and Tanya Augustine & Nicholas Bacci, School of Anatomical Sciences | Wits University

Real-world problem

What is unique about this research is that is brought together different disciplines with a common focus on trying to understand the effects of lightning on the body, with the long-term aim of making the environment safer for those at risk of being killed by lightning.

Associate Professor Ken Nixon from the School of Electrical and Information Engineering at Wits University and member of the Board of Directors of the African Centre for Lightning and Electromagnetics Network explains: “This is a multi-disciplinary project, which highlights how forensic scientists can work with physicists and engineers to explore a real-world problem, which is implicated in the deaths of many people annually, and especially in countries such as South Africa, Zambia and Uganda.”

“At a time when global climate change is driving increases in the number and severity of thunderstorms and lightning strikes, we need more research like this, bringing together different fields with real experience of dealing with lightning. Ultimately our aim at Wits is to make our built environment and countryside safer for those exposed to the lethal effects of lightning energy in South Africa, and to provide life-saving knowledge for those around the globe who are increasingly put in harm’s way of this natural phenomenon,” he says.

This research would not have been possible without state-of-the-art imaging technologies based in the School of Anatomical Science in the Faculty of Health Sciences at Wits, and the micro-CT facility at the Nuclear Energy Corporation of South Africa at Pelindaba.

“Researchers in South Africa are absolutely at the forefront of bringing together cutting edge imaging methods to discover new and ground-breaking knowledge about the skeleton of modern and ancient humans,” notes Dr. Tanya Augustine, an anatomist based at Wits Medical School, who co-led the research and is corresponding author on the paper.

“Over the last few years teams at Wits and NECSA have unlocked the secrets of cancer in the hominin fossil record, provided evidence for cause of death in australopithecines, and now these techniques are allowing us to unlock the mysteries of fatal lightning strikes,” she adds.

Reference: “Harnessing Thor’s Hammer: Experimentally induced lightning trauma to human bone by high impulse current” by Nicholas Bacci, Tanya Nadine Augustine, Hugh G.P. Hunt, Ken J. Nixon, Jakobus Hoffman, Lunga Bam, Frikkiede Beer and Patrick Randolph-Quinney, 3 November 2021, Forensic Science International Synergy.
DOI: 10.1016/j.fsisyn.2021.100206

3 Comments on "Harnessing Thor’s Hammer: Forensic Science Is Unlocking the Mysteries of Fatal Lightning Strikes"

  1. “At a time when global climate change is driving increases in the number and severity of thunderstorms and lightning strikes, …”

    Where is the support for this assertion? The original article neither makes this claim nor provides any citations to support it, despite some 60 references.

    What the original article does say is, “Real storm observation-based approximations SUGGEST a worldwide lightning flash density of 6 flashes/km2/year.” This hardly seems sufficiently precise to conclude that lightning strikes are increasing in response to the claimed ‘climate change.’

    Why is it that the quality of ‘science’ seems so uniformly poor with regard to all things climate related? Surely there can’t be a hidden agenda!

  2. This premise is clearly laughable, that climate change is causing increase in & severity of thunderstorms worldwide. I live in NE, in southern NH, as a person who enjoys thunderstorms I have to report that they have been as rare as hens teeth where I live, going so far as pointing out that we have gone a 2 year absence without any thunderstorm whatsoever, that was within a recent 5 year stretch. It has kicked up though, we had 1 storm this past summer and 1 the summer before that sad that a science site prefers to sensationalize what s nit even happening

  3. Nate Redshill | April 18, 2023 at 9:10 pm | Reply

    Just outside Boston, Mass. thunderstorms seemed more frequent in the 1960’s and ’70’s than now.
    But half the frequentcy of Pittsburgh, PA before 1962 when we moved away.

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