Google’s August 1st Core Update: Week 1

Google’s August 1st Core Update: Week 1

Temperatures by Vertical There's been speculation that this algo update targeted so called YMYL queries (Your Money or Your Life) and disproportionately impacted health and wellness sites. Here are the August 2nd temperatures by category: At first glance, the "Health" category does appear to be the most impacted. It's also important to note that this pattern shifted during the other three days of heavy flux, with other categories showing higher average temperatures. First and foremost, a site can gain or lose SERP share for many reasons that have nothing to do with algorithm updates. Second, any winners/losers analysis is only a snapshot in time (and often just one day). In this analysis, "Share" is a raw percentage of page-1 rankings in the MozCast 10K data set. I've limited this analysis to only sites that had at least 25 rankings across our data set on July 31 (below that the data gets very noisy). The final column is the overall share – this is very low for all but mega-sites (Wikipedia hovers in the colossal 5% range). Before you over-analyze, note the second column – this is the percent change from the highest July SERP share for that site. As a news site, Time's rankings are naturally volatile, and it's unclear whether this has much to do with the algorithm update.

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On August 1, Google (via Danny Sullivan’s @searchliaison account) announced that they released a “broad core algorithm update.” Algorithm trackers and webmaster chatter confirmed multiple days of heavy ranking flux, including our own MozCast system:

Temperatures peaked on August 1-2 (both around 114°F), with a 4-day period of sustained rankings flux (purple bars are all over 100°F). While this has settled somewhat, yesterday’s data suggests that we may not be done.

August 2nd set a 2018 record for MozCast at 114.4°F. Keep in mind that, while MozCast was originally tuned to an average temperature of 70°F, 2017-2018 average temperatures have been much higher (closer to 90° in 2018).

Temperatures by Vertical

There’s been speculation that this algo update targeted so called YMYL queries (Your Money or Your Life) and disproportionately impacted health and wellness sites. MozCast is broken up into 20 keyword categories (roughly corresponding to Google Ads categories). Here are the August 2nd temperatures by category:

At first glance, the “Health” category does appear to be the most impacted. Keywords in that category had a daily average temperature of 124°F. Note, though, that all categories showed temperatures over 100°F on August 1st – this isn’t a situation where one category was blasted and the rest were left untouched. It’s also important to note that this pattern shifted during the other three days of heavy flux, with other categories showing higher average temperatures. The multi-day update impacted a wide range of verticals.

Top 30 winners

So, who were the big winners (so far) of this update? I always hesitate to do a winners/losers analysis – while useful, especially for spotting patterns, there are plenty of pitfalls. First and foremost, a site can gain or lose SERP share for many reasons that have nothing to do with algorithm updates. Second, any winners/losers analysis is only a snapshot in time (and often just one day).

Since we know that this update spanned multiple days, I’ve decided to look at the percentage increase (or decrease) in SERP share between July 31st and August 7th. In this analysis, “Share” is a raw percentage of page-1 rankings in the MozCast 10K data set. I’ve limited this analysis to only sites that had at least 25 rankings across our…

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