Matsya Purana — Tripura Takes Refuge in the Ocean; Maya’s Hidden Nectar-Reservoir and the God...
अमरवरपुरे ऽपि दारुणो जलधररावमृदङ्गगह्वरः दनुतनयनिनादमिश्रितः प्रतिनिधिसंक्षुभिताणवोपमः //
amaravarapure 'pi dāruṇo jaladhararāvamṛdaṅgagahvaraḥ danutanayaninādamiśritaḥ pratinidhisaṃkṣubhitāṇavopamaḥ //
Even in the excellent city of the immortals there arose a dreadful, cavernous booming—like a kettle-drum—mixed with the roar of rain-clouds and the cries of the sons of Danu; it was as though the very hosts of the Daityas were being violently stirred into upheaval.
It presents a classic pralaya-omen: even the divine realm becomes disturbed by thunderous, war-like sounds, signaling cosmic disorder that precedes large-scale upheaval.
Though not prescribing duties directly, it implies that when ominous disturbances arise, rulers and householders should respond with vigilance, protection of dependents, and recourse to dharmic rites to steady society amid fear and instability.
No direct Vāstu rule appears; the ritual takeaway is the Purāṇic idea that abnormal sounds and widespread agitation function as omens, traditionally answered through śānti (appeasement) and protective rites.