Loud Pop When Splitting Cold

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As usual, cold weather splitting has its moments. Hardest part for me is getting a cold engine to start when the temp drops below 15 F. But, then the fun starts. I've found that several species of logs make a loud pop when the log splits, especially when you start at the log's dead center. The log appears to actually blow apart, and the noise is sometimes as loud as a cherry bomb -- Boom! On occasion, you have to be darn careful that someone isn't too close by because the split halves fly apart fast.

First question is, "What causes the noise?" I've heard several theories (1) sudden release of trapped air, like a balloon blowing up, (2) sudden breakage of trapped ice inside the log, (3) the combination of both, and (4) cold air makes the wood brittle with very little slow give. Second question is "Which firewood species have you found that pop the loudest?" Last week I split some white ash that put on quite a show, but I recall fruit woods, such as Bradford pear also fire a cannon.
 
True that it takes a whale of push to get the split started. So, are we saying that it's the frozen moisture inside the wood that causes the loud pop when it blows apart? That's option 2 in the OP.

Look at it this way. Water expands when frozen. That sets up pressure inside the log. When the log has no choice but to split, the extra pressure from the ice inside is suddenly released in a jiffy. Kaboom! Seem reasonable?
 
I think it's the ice shearing as the wood splits.

Aspen splits like a dream in the winter.
I have noticed that whenever I split wood that has dried for more than a season, it seldom if ever pops. That may be due to no moisture at all inside, so no ice. It's also more punky and has little internal strength left. Internal strength may also be a factor in this equation.
 
This sudden release of trapped frozen ice theory may be questionable. I recall splitting some Bradford pear one year in October that had been cut in June. It was prior to any hard freeze. Regardless, that stuff split apart like a bomb going off.
 
As usual, cold weather splitting has its moments. Hardest part for me is getting a cold engine to start when the temp drops below 15 F. But, then the fun starts. I've found that several species of logs make a loud pop when the log splits, especially when you start at the log's dead center. The log appears to actually blow apart, and the noise is sometimes as loud as a cherry bomb -- Boom! On occasion, you have to be darn careful that someone isn't too close by because the split halves fly apart fast.

First question is, "What causes the noise?" I've heard several theories (1) sudden release of trapped air, like a balloon blowing up, (2) sudden breakage of trapped ice inside the log, (3) the combination of both, and (4) cold air makes the wood brittle with very little slow give. Second question is "Which firewood species have you found that pop the loudest?" Last week I split some white ash that put on quite a show, but I recall fruit woods, such as Bradford pear also fire a cannon.

Most all of us know how much easier frozen wood splits than when it's warm.I think the boom happens as a result of the small amount of ice in the block and the shock of it letting go when serious force is applied.
 
Anyone who has spent a lot of time hunting the late season in the north country has heard similar sounds when it's real cold out.......pops and cracks......it's either a Yeti splitting wood or frozen trees popping.
 
Anyone who has spent a lot of time hunting the late season in the north country has heard similar sounds when it's real cold out.......pops and cracks......it's either a Yeti splitting wood or frozen trees popping.
Johnny, I agree and have heard that sound as well, But, is it the ice cracking inside or just air suddenly being released. OR, maybe the wood is just plain brittle at that temperature and it's like a bone cracking? Not sure...
 

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