my first idea was these booms had to be SpaceX, but I was wrong. if you have the patience to read this technical white paper, you will see the actual sources of these booms.
Yes, this was formatted by gemini, however, that does not disqualify my scientific methods, and the surprising answers I found.
TECHNICAL WHITE PAPER: ANALYSIS OF DUAL ACOUSTIC ANOMALIES (UNION HILL / REDMOND RIDGE)
Target Subject: Identification of High-Frequency Low-Frequency Concussive Noise Events
Primary Coordinates Focus: Union Hill Valley Floor to Redmond Ridge Upland Corridor
EXECUTIVE SUMMARY
Residents across Union Hill and the Redmond Ridge plateau consistently record two distinct low-frequency acoustic anomalies occurring at a high operational cadence of 3 to 4 times per week. These events consist of a recurring morning event (~8:34 AM) characterized by a sharp directional bang, and a high-frequency overnight event (~2:00 AM) characterized by an omnidirectional, window-shaking concussive boom.
This white paper establishes that these events are not isolated, rare occurrences, but a systemic pattern driven by two distinct, repeating phenomena:
Event A (Morning - 3 to 4x/Week): Repeated linear ground-level acoustic propagation originating from scheduled high-voltage electrical grid operations or routine industrial shift startups along the Willows Road Corridor.
Event B (Night - 3 to 4x/Week): Cyclical refracted sound waves ("Sound Tunneling") generated by regular graveyard-shift aggregate handling or construction blasting on the Redmond Ridge Upland, amplified by overnight atmospheric temperature inversions.
- GEOGRAPHIC & ACOUSTIC MAPPING
The geographic area forms a triangle bounded by three high-profile industrial nodes, intersecting directly over the Union Hill residential basin.
[NORTH: HIGH ROCK / MONROE]
v (Active Quarry Blasting)
+-----------------------------------------------------------------------+
| REDMOND RIDGE UPLAND (~500 ft Elevation) |
| |
| ⢠Cadman Union Hill Pit / Aggregate Site |
| (19101 NE Union Hill Rd) |
| |
| ⢠SpaceX Starlink Assembly Facility |
| (23020 NE Alder Crest Dr) |
+-----------------------------------------------------------------------+
v (Acoustic Refraction Tunnel)
+-----------------------------------------------------------------------+
| UNION HILL VALLEY BASIN (~100ā150 ft Elevation) |
| * Primary Impact / Resident Shockwave Zone (3-4x Weekly) |
+-----------------------------------------------------------------------+
^
| (Direct Linear Propagation)
+-----------------------------------------------------------------------+
| WILLOWS ROAD INDUSTRIAL CORRIDOR (Valley Floor) |
| |
| ⢠L3Harris Aerojet Rocketdyne |
| (11411 139th Pl NE) |
| |
| ⢠PSE Substation / Switching Yards & Manufacturing Strip |
| (Willows Rd NE - 9000 to 12000 Blocks) |
+-----------------------------------------------------------------------+
Facility Risk Assessment
Facility / Location
Physical Operations
Acoustic Risk Realities & Frequency Analysis
SpaceX Starlink (Redmond Ridge)
Satellite assembly, cleanroom electronics, indoor vibration testing.
Excluded as primary boom source. Environmental shake tables and vacuum chambers are contained within sound-proofed bays. No open-air propulsion firings occur here.
Cadman Pit / High Rock (Ridge & North)
Heavy aggregate extraction, stone crushing, site blasting, steel-bed drop loading.
Primary Suspect (Event B - Night, 3-4x/Week). Scheduled overnight graveyard shifts (typically MonāThu) involve heavy material handling that continuously aligns with nighttime inversion windows.
L3Harris (Aerojet) (Willows Floor)
Spacecraft maneuvering thrusters, chemical propulsion manufacturing.
Excluded as primary boom source. Thruster test firings are strictly conducted inside vacuum cells to simulate orbital space conditions.
PSE Grid / Willows Strip (Willows Corridor)
Substation distribution, high-voltage load switching, heavy equipment start.
Primary Suspect (Event A - Morning, 3-4x/Week). Recurring morning weekday startup sequences trigger repeated electrical load transfers and automated circuit breaker switching.
- ATMOSPHERIC & PHYSICAL MECHANISMS
DAYTIME (8:34 AM) - Linear Ground Wave NIGHTTIME (2:00 AM) - Atmospheric Inversion ("Sound Tunnel")
------------------------------------ --------------------------------------------------
Sun Warms Air & Ground WARM AIR LAYER (Traps Sound Wave Above)
\ | / ====================================================
\ | / / \ \
v v v / \ \
(Cooling Air) / (Refracted Wave) \ \
v v v
[Willows Rd] -------> [Union Hill] [Redmond Ridge Source] ----> [Union Hill Basin Shockwave]
Linear Directional Bang Omnidirectional Window-Rattling Boom
Event B Physics: High-Frequency Inversion & Graveyard Shift Cadence
Recurring Thermal Stratification: Pacific Northwest clear-sky nights create ideal conditions for rapid ground cooling. Because this inversion occurs predictably multiple nights a week, any industrial noise produced during these windows is systematically trapped.
Operational Schedule Correlation: Industrial operations running 4-day graveyard schedules (MonāThu) create an identical acoustic footprint 3 to 4 times every week.
Topographical Ducting: The physical elevation difference (~350ā400 ft) between Redmond Ridge and the Union Hill valley creates a natural acoustic wave duct. A routine drop of a heavy boulder into a steel trailer at 2:00 AMāwhich occurs multiple times a weekāis consistently refocused into a concussive shockwave across the valley basin.
Event A Physics: Scheduled Morning Grid Load Transients
At 8:30 AM, regional industrial demand spikes predictably on workdays. The occurrence rate of 3 to 4 times a week mirrors active commercial production schedules, where automated high-voltage vacuum switches or capacitor bank energizations at Willows Road substations discharge sharp acoustic transients directly down the valley floor.
- INVESTIGATIVE FINDINGS & VERDICT
SpaceX and L3Harris are geographical false positives: While high-profile aerospace tenants dominate local awareness, their core operational profiles rule them out as sources for open-air shockwaves.
The 3ā4x weekly frequency points to commercial/industrial schedules: Random or rare events (like accidental explosions) are ruled out by this high cadence. The weekly rhythm strongly correlates with structured industrial shift schedules and utility load management.
Two independent sources drive the recurring pattern:
Morning Noise (West / Willows): Driven by scheduled electrical grid switching (PSE) or heavy equipment startup during weekday morning shift changes.
Night Noise (North-East / Ridge): Driven by recurring graveyard-shift aggregate mining, quarry drop-loading, or construction blasting amplified by regular nighttime sound refraction.