Talking about urban media archaeology (see previous post), notion that Shannon Mattern examines in her work, it is worth trying to give a definition -or, more precisely, various definitions- of the term.
Below I cite the definition that Jussi Parikka gives in her blog Cartographies of Media Archaeology:
Media archaeology has succeeded in establishing itself as a heterogeneous set of theories and methods that investigate media history through its alternative roots, its forgotten paths, and neglected ideas and machines that still are useful when reflecting the supposed newness of digital culture. The definitions have ranged from emphasising the recurring nature of media cultural discourses (Huhtamo) to media archaeology as an-archaeology, or variantology (Zielinski) which in its excavation of the deep time layers of the way we sense and use our media always tries to find an alternative route to dismantle the fallacy of linear development.
Furthermore, I see media archaeology as a history-theory enterprise, in which temporal excavation of media functions as a theoretical force as well; a reading of old media and new media in parallel lines. Media archaeology is decisively non-linear, and rigorously theoretical in its media historical interest of knowledge. In a Benjaminian vein, it abandons historicism when by it is meant the idea that the past is given and out there waiting for us to find it; instead, it believes in the radical assembling of history, and histories in the plural, but so that it is not only a subset of cultural historical writing. Instead, media archaeology needs to insist both on the material nature of its enterprise – that media are always articulated in material, also in non-narrative frameworks whether technical media such as phonographs, or algorithmic such as databases and software networks – and that the work of assembling temporal mediations takes place in an increasingly varied and distributed network of institutions, practices and technological platforms. Indeed, what media archaeology investigates are also the practical rewirings of time, as is done in media artistic and creative practice work, through archives digital and spatial, as well as DIY and circuit bending which recycle, and remix obsolete technology as much as they investigate how technology is the framework for temporality for us.