Link Velocity Explained: What's Normal and What's Suspicious
How to measure link acquisition rate and spot negative SEO before it damages rankings.
Link velocity is the rate at which a site earns (or loses) backlinks over time. A healthy pattern shows steady growth roughly matched to publishing and PR activity. Sudden spikes of 5× or more your baseline — especially from low-quality domains — are a strong indicator of a negative-SEO attack or accidental spam pickup.
What link velocity actually measures
Two related metrics:
- New referring domains per week/month — the rate you're gaining fresh sources.
- Net change — gains minus decays (links that disappeared).
Track both. A site can look healthy on gains while quietly losing older, higher-authority links.
Establishing your baseline
Look at the trailing 6 months of weekly new referring domains. The median is your baseline. Everything else is measured against it.
- Normal: ±30% around baseline week-over-week.
- Watch: 2–4× baseline for one week. Often a viral moment or PR hit.
- Alarm: 5× baseline or higher, from low-authority domains, no PR context. Investigate immediately.
Signs of a negative-SEO attack
Multiple signals together, not any one alone:
- Sudden spike (5× baseline) in one week.
- New domains concentrated on a single hosting IP or WHOIS registrant.
- Anchor text is commercial exact-match ("buy X cheap") when your natural anchors are branded.
- Language mismatch — Russian, Chinese, Turkish domains linking to an English-only site.
- Toxicity scores > 70 on the majority of new links.
Sudden gains that are legitimate
Not every spike is an attack. Legit reasons for a velocity jump:
- A press mention picks up (news + syndications amplify fast).
- A blog post goes viral on Reddit, HN, or X.
- You launched a free tool that got shared in newsletters.
- Someone influential linked to you (their audience follows).
Check the source list before panicking.
How LemRank tracks velocity
The Backlinks module renders a weekly velocity chart with:
- Baseline shading (rolling 6-month median ±30%).
- Attack alerts when weekly gains breach 5× baseline and the majority score toxic.
- Domain-loss tracking — links that were live and disappeared, so you can see decay separately from gains.
- Alerts via the notification system when velocity thresholds are breached.
Common mistakes
- Watching only gains. Losing 30 authority links quietly is worse than gaining 30 spammy ones.
- Panicking on the first spike. One week isn't a trend. Look at 3-week rolling averages.
- Disavowing all links from a spike. Read them — legitimate press pickups can look spiky.
- No baseline. Without a baseline, you can't tell normal from abnormal.
What this doesn't do
- Velocity alone doesn't predict penalties — quality of links matters more.
- Losing links doesn't automatically hurt rankings — Google decayed weight from stale links long before they disappear.
Related
Frequently asked questions
What is a healthy link velocity for a small site?
For sites under 10K/mo organic traffic, 2–10 new referring domains per month is typical. Focus on consistency, not volume.
Can too-fast link growth cause a penalty?
Unusual velocity alone won't trigger a penalty, but combined with low quality it can. Natural growth patterns include occasional spikes.
How do I know if I'm under a negative SEO attack?
5× baseline spike + concentrated hosting + commercial exact-match anchors + language mismatch. Multiple signals together, not any one alone.
Should I disavow all links from an attack spike?
Only after review. Legitimate press pickups can look spiky. Manually verify toxic classification before disavowing.
How often should I check link velocity?
Weekly is standard. Set alert thresholds so you don't have to manually inspect.
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