Thursday 7 October 2021 · below the Index · spike
California oil spill blamed on cargo ship
A cargo ship anchored near an oil pipeline off Los Angeles made unusual movements around the time of an oil spill in early October 2021. The Coast Guard investigated whether the vessel snagged the pipeline. The incident drew attention to cargo ship congestion off the California coast.
Peak 85.2 on Thursday 7 October 2021. The shaded band is the incident window.
Where the attention came from
Mixed, both over the window and on the peak day. Mixed means no single signal dominated — the attention was spread across search, research, news and social. Social here is X alone — Bluesky only joins the series from July 2024 — so its level isn't directly comparable with today's series, though its share of this incident is real.
Bar = share of the extra attention over the whole window; the tick marks the share on the peak day alone, where the two differ.
How unusual it was
This was above 81% of all days since 2020, and the highest since Friday 4 June 2021.
How far it spread
Stayed in one vessel type — 1 of 6 vessel-type groups drew clearly more readers than usual.
Readers here means readers of the Wikipedia article on each vessel type — the same source as the Research signal, not news coverage — so an incident can dominate the news without moving this panel. Bars start at 1× — normal readership for that vessel type, the weeks before the incident. Grey = no clear lift. "Over time" shows each group's daily readers through the window; "All 12 articles" breaks the six groups back into their members.
How it was framed the frame glossary →
Lead frame: pollution event. Trade press was 2% of in-scope coverage — the story had left the trade press and gone mainstream. (Historical coverage is scored on headlines only.)
Acting, or acted upon
In 50% of coverage shipping was the thing acted upon rather than the actor.
How the coverage sounded
Coverage ran 62% negative overall.
Each article is scored on a five-step scale from strongly negative to strongly positive; the bar is the share of coverage at each step.
Sample of the headlines
- California oil spill: Coast Guard investigating whether cargo ship that made unusual movements may have snagged pipelinemsn.com · 2021-10-07
- Coast Guard boards cargo ship in California oil spill probelatimes.com · 2021-10-06
- Coast Guard investigates cargo ship in California oil spill - The San Diego Union-Tribunesandiegouniontribune.com · 2021-10-07
- Coast Guard investigates cargo ship in California oil spillbiztoc.com · 2021-10-07
- US Coast Guard boards massive German cargo ship that has become a focus of investigation into California oil spill9and10news.com · 2021-10-07
- Alert: US Coast Guard boards massive German cargo ship that has become a focus of investigation into California oil spillsfgate.com · 2021-10-07
Gold rule = a national or international outlet, not a trade title.
- social = X only before Bluesky (2024-07-01); not comparable with today's series
- Registered in a single underlying series only — one vessel-type article, news term or social query — and never moved the Index itself.
- The coverage panels count only articles matched to this incident specifically.
- decay half-life: >30 days (still elevated at window end)
Maritime Attention Index, incident: California oil spill blamed on cargo ship, peak 85.2 on 7 October 2021. maritimeattentionindex.com/incidents/2021-california-oil-spill-blamed-on-cargo-ship/