Sam Baldock grabbed a double as West Ham scored three goals in eight second-half minutes to ease past Blackpool and go second in the Championship table.
John Carew set the Hammers on their way, heading in from Julien Faubert's cross before the break.
The hosts missed several chances but Baldock did make it 2-0 on 47 minutes when he ran through and slotted home.
Baldock almost added a third from close range after good work from Carew, and Jack Collison's strike sealed the win.
Despite the scoreline, Blackpool started in confident fashion following their 5-0 win over Bristol City last time out.
In fact, they looked the better side until West Ham opened the scoring on 12 minutes when Faubert crossed from the right and Carew was strong enough to hold off Matt Hill and find the bottom corner with his header.
But that opening goal was the signal for almost complete home dominance and the Hammers could have added a second almost immediately but Baldock was denied by Matt Gilks in the Blackpool goal.
Gilks was soon in action again, saving from Carew after a poor defensive error by Hill and then blocking a Carew shot with his legs.
Hammers goalkeeper Manuel Almunia was finally involved just before the interval but had no trouble holding a low shot by Jonjo Shelvey - and that was about as good as it got for the visitors.
The hosts' second goal arrived when Blackpool tried to play a high offside trap and Baldock duly converted after racing on to Matthew Taylor's header.
Another Hill mistake then gifted a third goal when he let the ball bounce in the area and Carew flicked the ball on to Baldock who tapped it over the line.
Collison completed the rout when his deflected volley from 12 yards easily beat Gilks, and only a superb save by the overworked keeper prevented Baldock completing his hat-trick.
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Live Text Commentary
Full Time The referee brings the game to a close.90:00 +3:35
Lomana Tresor LuaLua decides to take the corner short.90:00 +3:17
Short corner taken by Lomana Tresor LuaLua from the right by-line.89:55
Free kick taken by Manuel Almunia.89:55 Booking
Booking Lomana Tresor LuaLua is booked.89:45
Free kick awarded for a foul by Lomana Tresor LuaLua on Papa Bouba Diop.89:24
Papa Bouba Diop gives away a free kick for an unfair challenge on Lomana Tresor LuaLua. Free kick taken by Barry Ferguson.81:23
Daniel Bogdanovic takes a outswinging corner from the right by-line to the near post.81:01
Corner taken short by Daniel Bogdanovic.80:30
Free kick awarded for an unfair challenge on Barry Ferguson by Kevin Nolan. Matthew Hill takes the free kick.79:27 Substitution
Substitution John Carew leaves the field to be replaced by Mark Noble.79:27
Gary Taylor-Fletcher takes a shot. Save made by Manuel Almunia. Effort on goal by Alex Baptiste from inside the area goes harmlessly over the bar.78:59
The referee blows for offside. Barry Ferguson takes the indirect free kick.78:16
Freddie Sears takes a shot. Comfortable save by Matthew Gilks.77:39
Sam Baldock takes a shot. Save by Matthew Gilks. Outswinging corner taken from the right by-line by Jack Collison.71:49
Daniel Bogdanovic has a direct shot on goal from the free kick.71:49 Substitution
Substitution Daniel Bogdanovic replaces Kevin Phillips.71:49 Substitution
Substitution Lomana Tresor LuaLua comes on in place of Jonjo Shelvey.71:49 Substitution
Substitution Brett Ormerod is brought on as a substitute for Thomas Ince.71:49
Free kick awarded for a foul by Abdoulaye Faye on Kevin Phillips.
Keith Southern fouled by Sam Baldock, the ref awards a free kick. Direct free kick taken by Matthew Hill.68:53
Ian Evatt handles the ball and concedes a free kick. Kevin Nolan takes the free kick.65:13
The official flags Sam Baldock offside. Matthew Gilks restarts play with the free kick.62:44
Outswinging corner taken right-footed by Jack Collison from the right by-line, Close range headed effort by Winston Reid misses to the right of the goal.61:17 Substitution
Substitution Freddie Sears on for Matthew Taylor.61:17
Shot by Jonjo Shelvey from outside the box goes high over the crossbar.59:29 Substitution
Substitution Abdoulaye Faye is brought on as a substitute for James Tomkins.57:15
Close range strike by John Carew goes over the bar.56:53
Sam Baldock is caught offside. Matthew Gilks takes the free kick.55:58
Close range effort by Matthew Taylor goes over the bar.55:39
Sam Baldock takes a shot. Save by Matthew Gilks.54:01
Assist on the goal came from George McCartney.54:01 Goal scored
Goal! - Jack Collison - West Ham 4 - 0 Blackpool A goal is scored by Jack Collison from inside the area to the bottom left corner of the goal. West Ham 4-0 Blackpool.53:16
Gary Taylor-Fletcher concedes a free kick for a foul on Winston Reid. Manuel Almunia takes the direct free kick.52:56
The assistant referee signals for offside against John Carew. Barry Ferguson restarts play with the free kick.52:06
Thomas Ince produces a left-footed shot from close range which goes wide of the left-hand upright.50:42
Assist by John Carew.50:42 Goal scored
Goal! - Sam Baldock - West Ham 3 - 0 Blackpool Sam Baldock finds the net with a goal from close range low into the middle of the goal. West Ham 3-0 Blackpool.48:15
The assistant referee flags for offside against Matthew Taylor. Indirect free kick taken by Alex Baptiste.46:43
Matthew Taylor provided the assist for the goal.46:43 Goal scored
Goal! - Sam Baldock - West Ham 2 - 0 Blackpool Sam Baldock finds the back of the net with a goal from deep inside the penalty box to the bottom right corner of the goal. West Ham 2-0 Blackpool.45:36
Shot on goal by Matthew Taylor from just inside the area clears the crossbar.45:01
The second half begins.45:00 +2:21 Half time
Half Time The ref blows to end the first period.45:00 +0:15
Jonjo Shelvey takes a shot. Save made by Manuel Almunia.43:21
The official flags Sam Baldock offside. Free kick taken by Barry Ferguson.42:42
John Carew takes a shot. Save by Matthew Gilks. Sam Baldock produces a right-footed shot from close in that goes over the bar.40:53
John Carew challenges Matthew Hill unfairly and gives away a free kick. Matthew Gilks takes the direct free kick.40:32
Free kick awarded for an unfair challenge on Matthew Hill by John Carew. Direct free kick taken by Keith Southern.38:51
Kevin Phillips fouled by Papa Bouba Diop, the ref awards a free kick. Jonjo Shelvey shoots direct from the free kick.36:02
The assistant referee signals for offside against Alex Baptiste. Manuel Almunia restarts play with the free kick.34:39
Kevin Phillips takes a shot. Save by Manuel Almunia.34:19
Sam Baldock concedes a free kick for a foul on Matthew Hill. Matthew Gilks takes the direct free kick.31:05
John Carew concedes a free kick for a foul on Ian Evatt. Matthew Gilks takes the direct free kick.27:32
Inswinging corner taken left-footed by Matthew Taylor, clearance made by Ian Evatt.27:04
John Carew takes a shot. Matthew Gilks makes a save.22:12
Barry Ferguson gives away a free kick for an unfair challenge on John Carew. Free kick crossed right-footed by Julien Faubert from left channel.21:23
Shot by Barry Ferguson from a long way out goes over the crossbar.16:44
Stephen Crainey restarts play with the free kick.16:44 Booking
Booking Booking for Julien Faubert for unsporting behaviour.16:29
Julien Faubert concedes a free kick for a foul on Gary Taylor-Fletcher.15:12
The official flags Jack Collison offside. Matthew Gilks takes the free kick.13:18
Sam Baldock is ruled offside. Matthew Gilks takes the free kick.13:04
Sam Baldock takes a shot. Save made by Matthew Gilks.11:40
Assist by Julien Faubert.11:40 Goal scored
Goal! - John Carew - West Ham 1 - 0 Blackpool John Carew scores a headed goal from deep inside the penalty box. West Ham 1-0 Blackpool.11:38
Julien Faubert produces a cross,8:03
Unfair challenge on Kevin Nolan by Kevin Phillips results in a free kick. Manuel Almunia restarts play with the free kick.7:41
Corner taken by Jonjo Shelvey, Manuel Almunia makes a save.6:52 Booking
Booking Matthew Taylor is shown a yellow card.6:25
Matthew Taylor challenges Thomas Ince unfairly and gives away a free kick. Thomas Ince takes the free kick.6:09
Free kick awarded for an unfair challenge on Ian Evatt by John Carew. Matthew Gilks restarts play with the free kick.0:29
Kevin Nolan concedes a free kick for a foul on Barry Ferguson. Kevin Phillips takes the free kick.0:00
The referee gets the game started.
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