* Sound Design: Welles used a combination of sound effects, music, and voice acting to create a realistic and immersive experience. The use of sound effects like explosions, marching, and the horrifying "heat ray" noises created a sense of immediacy and danger. The eerie, atonal music added to the unsettling atmosphere.
* Breaking the Fourth Wall: The play was presented as a live news bulletin, which blurred the lines between fiction and reality. The newsreader's panicked voice and the interruptions with "breaking news" created a sense of urgency and believability. This was particularly effective because people were accustomed to hearing news bulletins on the radio.
* Use of Interrupted Broadcasting: Welles's decision to interrupt the broadcast with "live" updates from the military and government officials created a sense of chaos and uncertainty. The shifting perspective from news reporter to eyewitness to government spokesperson intensified the fear and panic.
* Realism and Specificity: The use of real locations like New Jersey, Newark, and Grover's Mill heightened the feeling of immediacy and made the fictional invasion seem more plausible. The detailed descriptions of the Martian technology and the alien's appearance added to the sense of realism.
* Emotional Impact: The voice acting was powerful and emotionally charged. Welles's deep, dramatic voice, coupled with the panicked reactions of the newsreader and characters, evoked a powerful sense of fear and despair.
* The Power of Imagination: Radio, unlike books, allows the listener to fill in the blanks with their own imagination. The lack of visual imagery allows the listener to create their own personal horror, which can be even more frightening than what is actually described.
* The Power of the Collective: While the book focuses on the individual protagonist, the radio play emphasized the collective response to the invasion. The panicked reactions of the newsreader, the military, and the public created a sense of shared fear and vulnerability.
In essence, Welles took advantage of the unique strengths of the radio medium to create a chilling and immersive experience. The combination of realistic sound design, breaking the fourth wall, and creating a sense of immediacy and panic created a far more potent and terrifying experience for the listener than reading the book could ever achieve.