It’s an all too familiar movie trope. A bug hidden in a flower jar. A figure in shadows crouched listening at a door. The tape recording that no one knew existed, revealed at the most decisive of moments. Even the abrupt disconnection of a phone call manages to arouse the suspicion that we are never as alone as we may think. And although surveillance derives its meaning the latin “vigilare” (to watch) and French “sur-“ (over), its deep connotations of listening have all but obliterated that distinction.
Rounding out our series on surveillance, Kathleen Battles offers a historical perspective that shows how early twentieth century crime drama naturalized practices of citizen surveillance. A million eyes were activated as millions of listeners learned that the immediacy of radio and telephone allowed for an unprecedented level of participation in law enforcement. Calling all cars…Calling all cars… -AT
Police Headquarters, a 1932 radio crime drama, was produced in the infancy of narrative radio. Containing barely 12 minutes of narrative content, the program opened each episode with a repeating segment of call, connection, and dispatch to quickly establish both the crime committed and how the police responded to it. For example, in the “Payroll Robbery” episode it takes just over a minute and a half to hear a phone call to the titular headquarters, its connection to the proper unit, a radio call to a specific police car, and the responding officers arriving at the assigned location. Compared with the graphically and visually intense images of modern surveillance in contemporary popular culture, this brief exchange no doubt sounds quaint, simplistic, and even banal. After all, radios, cars, and telephones have served as the routine backdrop of most police dramas for some 70 years. But in 1932 the interlinking of these technologies was factually, as well as imaginatively, novel. This essay shows how radio, as “new media,” was central to imagining surveillance in sonic terms, prefiguring many features of contemporary surveillance practices.
The introduction of radio and cars into police work took place in the first decades of the twentieth century, especially during the years between the two world wars that Richard Popp (2011) calls “the machine age”. He argues that this period witnessed vast transformations brought on by cars and radios, which, when combined with existing technologies like the telephone, forged new communication networks that transformed both work and leisure. These changes were central to the narratives of criminality and policing that emerged during the interwar years. Police were the focus of radio dramas, including Police Headquarters and Calling All Cars. These dramas played with the intermingling of automobility, telephony, and radio in ways that spoke to the main problems police forces saw themselves facing: organized, professional, mobile, machine-age criminals. Cars, telephones, and automobiles were not just tools to criminals, but they were also the building blocks for a machine age surveillance made possible by the sonic power of radio.
Recently, Robin James (2014) has suggested that the acousmatic is a useful metaphor for understanding the emerging practices of data based surveillance. Acousmatic surveillance listens for patterns in “ambient data environments” instead of profiling individuals in the panoptic sense. At the turn of the twentieth century, radio allowed for a panacoustic mastery of spaces that bridged both panoptic and acousmatic surveillance. Radio also speaks to another key feature of information age surveillance, what Mark Andrejevic (2011) describes as the “redoubling of tools for communication and leisure as technologies for surveillance and security.” (165-66) The technical capabilities and imaginative potentials of radio help us to consider it both as a police technology and entertainment medium. The sonic power of radio was often figured as an “Invisible Man Hunter,” whose realignment of spatial and temporal arrangements rendered criminal escape impossible. As an entertainment medium, radio’s aurality was key to understanding its imaginative potential as highly intimate and mobile: invasive and expansive.
In Police Headquarters we hear how radio’s sonic and aural qualities come together. Radio acts as the link between the telephone and car, allowing for a swift response to a citizen request. The tactical use of sound effects and narrative compression in the broadcast situate the listener inside a machine like apparatus that presents the police as always available. At their broadest level, radio crime dramas aurally situate communication and transportation technologies, like radio, as key to both the narrative organization of the story and as a plot element. In the opening to the “Stop That Car” episode of Calling All Cars, a dispatcher advises for cars to be on the lookout for a specific car involved in a hit and run, including the address of the crime and possible location of the vehicle. Overlaid with sound effects made to signify a car, these openings situate listeners as riders eavesdropping on the adventures of mobile police officers. As the program’s title suggests, each episode opened with a police radio call, often voiced by real life LAPD dispatcher, Jessie Rosenquist. The program’s sponsor was the gasoline company that supplied the fuel for LAPD patrol cars – further linking cars and radio as a key theme. In the opening to the “Two Man Crime Wave Episode,” the very ad for the product is performed as a police radio call.
The conceit of eavesdropping on a police adventure did much to link private life and the police. This theme runs tandem to radio’s sonic immediacy, which allowed listeners to imagine a seemingly instantaneous response to citizen phone calls.. For example, the “July 4th in a Radio Car” episode of Calling All Cars situates radio listeners as sonic participants, able to ride along with police from the comfort of their own living rooms. Here, cars respond to a number of calls made by private citizens that bring the policing function into daily life. There is even one call that involves domestic violence, in particular. Throughout the episode, police are situated as an available force – thanks to the telephone, radio, and automobile – to adjudicate all manner of private disputes. In these particular instances the intimacy of radio as a machine age technology is “redoubled” with radio as a police technology. Radio’s intimate address allowed the voices of police officers to enter the private space of the home. At the same time, the machinery of crime fighting required citizen participation, most often figured through the phone call from within the space of the home to the police.
If the intimacy of radio served to cross the divide between public and private, the spatial-temporal collapse achieved by radio made it ideal for sonically monitoring great swaths of space. Intimately linked with cars, radio was understood as especially mobile. Radio’s ability to compress the relationship between space and time is frequently dramatized. For example, in the “Crime vs. Time” episode of Calling All Cars, the host explains how radio has rendered the average response time to a police call for help only two minutes and forty seconds. The episode then proceeds to show how radio was used by the police to track and apprehend two men who robbed a movie theater. Representing phone and radio calls, while specifically referencing geographic locations, radio dramatists used radio’s aural dimensions to render radio’s sonic power of surveillance. Capable of reaching everywhere, police radio, when linked with the telephone and automobile, could be used to sonically pinpoint any somewhere that a criminal might try to escape to.
In our era of high-tech and sophisticated technologies, visually rich narratives, and algorithmically driven methods of tracking, there is certainly something simple, comforting, and even nostalgic in these tales of low-tech machine age criminal apprehension. Depression era true crime dramas certainly do not offer the kind of sophistication as information age narratives, such as The Wire. The medium’s sonic qualities were key to linking together its use as both a police instrument and as a domestic entertainment technology. With sonic forces invisibly and silently crossing the into intimate domestic spaces and covering large swaths of territory, radio became key to imagining many features that we take for granted as “new” about the information age: the control of movement across space, the constant availability of communicative connection, the promise of perfect coordination across a field of institutional actors, the marshaling of citizen participation in surveillance efforts, and the construction of increasingly intimate links between domestic life and law enforcement procedures. In serving as central node in refiguring shifting notions of space and time that existing institutions were not prepared to handle, radio’s sonic qualities remapped the meaning of police work and helped to establish a relationship between the police and citizen body that still resonates today. While not as technologically sophisticated, machine age policing and police narratives took advantage of radio’s double function as both a machine of coordination and medium of entertainment to extend the policing function into more areas of life. This reflects a sonic mode of power that allows neither the interior space of the home nor the exterior world of the road relief from police presence. This moment of technological interconnection, however, evoked the excitement and anxiety that made sonic surveillance at once thrilling and calming; a salve to soothe the woes of a world that now seemed intensely close and impossibly far flung. Is it any wonder that while some fret over the power of corporate and state dataveillance today, that some continue to find comfort in the possibility of being recognized as someone in a world of ever more intense interconnection?
Featured image “Radio for Backup” by Jonathan Flinchbaugh CC BY-NC-SA.
Kathleen Battles is Associate Professor and Graduate Director in the Department of Communication and Journalism at Oakland University. Her research focuses on radio history, especially as it relates to issues of policing, sound and surveillance, questions concerning technology and culture, and sexuality and the media. She is the author of Calling All Cars: Radio Dragnets and the Technology of Policing (University of Minnesota Press, 2010); co-editor (with Joy Hayes and Wendy Hilton-Morrow) of War of the Worlds to Social Media: Mediated Communication in Times of Crisis (Peter Lang, 2013); and co-author (with Wendy Hilton-Morrow) of Sexual Identities and the Media: An Introduction (Routledge, 2015). In addition, her work has appeared in Critical Studies in Media Communication, The Radio Journal, and the Journal of Homosexuality.
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Acousmatic Surveillance and Big Data-Robin James
Welcome back to Hearing the UnHeard, Sounding Out‘s series on how the unheard world affects us, which started out with my post on hearing large and small, continued with a piece by China Blue on the sounds of catastrophic impacts, and now continues with the deep sounds of the Earth itself by Earth Scientist Milton Garcés.
Faculty member at the University of Hawaii at Manoa and founder of the Earth Infrasound Laboratory in Kona, Hawaii, Milton Garces is an explorer of the infrasonic, sounds so low that they circumvent our ears but can be felt resonating through our bodies as they do through the Earth. Using global networks of specialized detectors, he explores the deepest sounds of our world from the depths of volcanic eruptions to the powerful forces driving tsunamis, to the trails left by meteors through our upper atmosphere. And while the raw power behind such events is overwhelming to those caught in them, his recordings let us appreciate the sense of awe felt by those who dare to immerse themselves.
In this installment of Hearing the UnHeard, Garcés takes us on an acoustic exploration of volcanoes, transforming what would seem a vision of the margins of hell to a near-poetic immersion within our planet.
– Guest Editor Seth Horowitz
The sun rose over the desolate lava landscape, a study of red on black. The night had been rich in aural diversity: pops, jetting, small earthquakes, all intimately felt as we camped just a mile away from the Pu’u O’o crater complex and lava tube system of Hawaii’s Kilauea Volcano.
The sound records and infrared images captured over the night revealed a new feature downslope of the main crater. We donned our gas masks, climbed the mountain, and confirmed that indeed a new small vent had grown atop the lava tube, and was radiating throbbing bass sounds. We named our acoustic discovery the Uber vent. But, as most things volcanic, our find was transitory – the vent was eventually molten and recycled into the continuously changing landscape, as ephemeral as the sound that led us there in the first place.
Volcanoes are exceedingly expressive mountains. When quiescent they are pretty and fertile, often coyly cloud-shrouded, sometimes snowcapped. When stirring, they glow, swell and tremble, strongly-scented, exciting, unnerving. And in their full fury, they are a menacing incandescent spectacle. Excess gas pressure in the magma drives all eruptive activity, but that activity varies. Kilauea volcano in Hawaii has primordial, fluid magmas that degass well, so violent explosive activity is not as prominent as in volcanoes that have more evolved, viscous material.
Well-degassed volcanoes pave their slopes with fresh lava, but they seldom kill in violence. In contrast, the more explosive volcanoes demolish everything around them, including themselves; seppuku by fire. Such massive, disruptive eruptions often produce atmospheric sounds known as infrasounds, an extreme basso profondo that can propagate for thousands of kilometers. Infrasounds are usually inaudible, as they reside below the 20 Hz threshold of human hearing and tonality. However, when intense enough, we can perceive infrasound as beats or sensations.
Like a large door slamming, the concussion of a volcanic explosion can be startling and terrifying. It immediately compels us to pay attention, and it’s not something one gets used to. The roaring is also disconcerting, especially if one thinks of a volcano as an erratic furnace with homicidal tendencies. But occasionally, amidst the chaos and cacophony, repeatable sound patterns emerge, suggestive of a modicum of order within the complex volcanic system. These reproducible, recognizable patterns permit the identification of early warning signals, and keep us listening.
Each of us now have technology within close reach to capture and distribute Nature’s silent warning signals, be they from volcanoes, tsunamis, meteors, or rogue nations testing nukes. Infrasounds, long hidden under the myth of silence, will be everywhere revealed.
I first heard these volcanic sounds in the rain forests of Costa Rica. As a graduate student, I was drawn to Arenal Volcano by its infamous reputation as one of the most reliably explosive volcanoes in the Americas. Arenal was cloud-covered and invisible, but its roar was audible and palpable. Here is a tremor (a sustained oscillation of the ground and atmosphere) recorded at Arenal Volcano in Costa Rica with a 1 Hz fundamental and its overtones:
In that first visit to Arenal, I tried to reconstruct in my minds’ eye what was going on at the vent from the diverse sounds emitted behind the cloud curtain. I thought I could blindly recognize rockfalls, blasts, pulsations, and ground vibrations, until the day the curtain lifted and I could confirm my aural reconstruction closely matched the visual scene. I had imagined a flashing arc from the shock wave as it compressed the steam plume, and by patient and careful observation I could see it, a rapid shimmer slashing through the vapor. The sound of rockfalls matched large glowing boulders bouncing down the volcano’s slope. But there were also some surprises. Some visible eruptions were slow, so I could not hear them above the ambient noise. By comparing my notes to the infrasound records I realized these eruption had left their deep acoustic mark, hidden in plain sight just below aural silence.
I then realized one could chronicle an eruption through its sounds, and recognize different types of activity that could be used for early warning of hazardous eruptions even under poor visibility. At the time, I had only thought of the impact and potential hazard mitigation value to nearby communities. This was in 1992, when there were only a handful of people on Earth who knew or cared about infrasound technology. With the cessation of atmospheric nuclear tests in 1980 and the promise of constant vigilance by satellites, infrasound was deemed redundant and had faded to near obscurity over two decades. Since there was little interest, we had scarce funding, and were easily ignored. The rest of the volcano community considered us a bit eccentric and off the main research streams, but patiently tolerated us. However, discussions with my few colleagues in the US, Italy, France, and Japan were open, spirited, and full of potential. Although we didn’t know it at the time, we were about to live through Gandhi’s quote: “First they ignore you, then they laugh at you, then they fight you, then you win.”
Fast forward 22 years. A computer revolution took place in the mid-90’s. The global infrasound network of the International Monitoring System (IMS) began construction before the turn of the millennium, in its full 24-bit broadband digital glory. Designed by the United Nations’s Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO), the IMS infrasound detects minute pressure variations produced by clandestine nuclear tests at standoff distances of thousands of kilometers. This new, ultra-sensitive global sensor network and its cyberinfrastructure triggered an Infrasound Renaissance and opened new opportunities in the study and operational use of volcano infrasound.
Suddenly endowed with super sensitive high-resolution systems, fast computing, fresh capital, and the glorious purpose of global monitoring for hazardous explosive events, our community rapidly grew and reconstructed fundamental paradigms early in the century. The mid-naughts brought regional acoustic monitoring networks in the US, Europe, Southeast Asia, and South America, and helped validate infrasound as a robust monitoring technology for natural and man-made hazards. By 2010, infrasound was part of the accepted volcano monitoring toolkit. Today, large portions of the IMS infrasound network data, once exclusive, are publicly available (see links at the bottom), and the international infrasound community has grown to the hundreds, with rapid evolution as new generations of scientists joins in.
In order to capture infrasound, a microphone with a low frequency response or a barometer with a high frequency response are needed. The sensor data then needs to be digitized for subsequent analysis. In the pre-millenium era, you’d drop a few thousand dollars to get a single, basic data acquisition system. But, in the very near future, there’ll be an app for that. Once the sound is sampled, it looks much like your typical sound track, except you can’t hear it. A single sensor record is of limited use because it does not have enough information to unambiguously determine the arrival direction of a signal. So we use arrays and networks of sensors, using the time of flight of sound from one sensor to another to recognize the direction and speed of arrival of a signal. Once we associate a signal type to an event, we can start characterizing its signature.
Consider Kilauea Volcano. Although we think of it as one volcano, it actually consists of various crater complexes with a number of sounds. Here is the sound of a collapsing structure
As you might imagine, it is very hard to classify volcanic sounds. They are diverse, and often superposed on other competing sounds (often from wind or the ocean). As with human voices, each vent, volcano, and eruption type can have its own signature. Identifying transportable scaling relationships as well as constructing a clear notation and taxonomy for event identification and characterization remains one of the field’s greatest challenges. A 15-year collection of volcanic signals can be perused here, but here are a few selected examples to illustrate the problem.
First, the only complete acoustic record of the birth of Halemaumau’s vent at Kilauea, 19 March 2008:
Here is a bench collapse of lava near the shoreline, which usually leads to explosions as hot lava comes in contact with the ocean:
Here is one of my favorites, from Tungurahua Volcano, Ecuador, recorded by an array near the town of Riobamba 40 km away. Although not as violent as the eruptive activity that followed it later that year, this sped-up record shows the high degree of variability of eruption sounds:
The infrasound community has had an easier time when it comes to the biggest and meanest eruptions, the kind that can inject ash to cruising altitudes and bring down aircraft. Our Acoustic Surveillance for Hazardous Studies (ASHE) in Ecuador identified the acoustic signature of these type of eruptions. Here is one from Tungurahua:
Our data center crew was at work when such a signal scrolled through the monitoring screens, arriving first at Riobamba, then at our station near the Colombian border. It was large in amplitude and just kept on going, with super heavy bass – and very recognizable. Such signals resemble jet noise — if a jet was designed by giants with stone tools. These sustained hazardous eruptions radiate infrasound below 0.02 Hz (50 second periods), so deep in pitch that they can propagate for thousands of kilometers to permit robust acoustic detection and early warning of hazardous eruptions.
In collaborations with our colleagues at the Earth Observatory of Singapore (EOS) and the Republic of Palau, infrasound scientists will be turning our attention to early detection of hazardous volcanic eruptions in Southeast Asia. One of the primary obstacles to technology evolution in infrasound has been the exorbitant cost of infrasound sensors and data acquisition systems, sometimes compounded by export restrictions. However, as everyday objects are increasingly vested with sentience under the Internet of Things, this technological barrier is rapidly collapsing. Instead, the questions of the decade are how to receive, organize, and distribute the wealth of information under our perception of sound so as to construct a better informed and safer world.
http://www.iris.edu/bud_stuff/dmc/bud_monitor.ALL.html, search for IM and UH networks, infrasound channel name BDF
Milton Garcés is an Earth Scientist at the University of Hawaii at Manoa and the founder of the Infrasound Laboratory in Kona. He explores deep atmospheric sounds, or infrasounds, which are inaudible but may be palpable. Milton taps into a global sensor network that captures signals from intense volcanic eruptions, meteors, and tsunamis. His studies underscore our global connectedness and enhance our situational awareness of Earth’s dynamics. You are invited to follow him on Twitter @iSoundHunter for updates on things Infrasonic and to get the latest news on the Infrasound App.
Featured image: surface flows as seen by thermal cameras at Pu’u O’o crater, June 27th, 2014. Image: USGS
Catastrophic Listening — China Blue