I guess you are positing the question "how different are they", for some humorous effect. 'Cause you must know! Also, thanks for the subtle correction of my use of "seismographs" when I meant "seismometers." As to the difference between accelerometers and seismometers for the question at hand, the accelerometers would be just the thing for the system in Turkey that you describe. They would provide rapid post-quake, accurate descriptions of local accelerations - providing emergency responders the data they would need to get an initial assesment of where (and if) their efforts should be directed. But they are not ideal for earthquake warning systems since they provide no quick data during the first few seconds of a quake that can be used by automated systems to determine if a major quake is about to occur. For that, seismometers are the thing. Also, the accelerometers, to function in their intended role, would need to be numerous and strategically placed in each area where response information is expected to be needed. For an early-warning system, in theory, only one, or a very few, seismometers (not accelerometers) would be needed, and its location would simply need to be fairly near a fault segment which poses a threat to the distant location where the warning would be required.

All the above is from an amateur working from memory.

Way back in 1994, at an SSA Annual Meeting, I bought an Engdahl "Intensitron". It was essentially an accelerometer, actually 3 accelerometers-one for each axis, North-South, East-West and vertical. It would display the acceleration for each axis as a percent of "G" in three LCD displays. In addition, it would sound an audible alarm if any reading was greater than a manually-set percent of "G". The device actually used, also, a proprietary circuitry that calculated "the area under the curve" (a calculus-type approach, combining acceleration and time, IIRC). As an accelerometer, basically, it was not a teleseismic device. It could only be expected to respond to local events. I bolted it solidly to the hearth of my fireplace, where it sat there for 9 years, responding only to bumps from the vacuum cleaner or pets. In the Spring of 2003 I removed it for some reason, setting it temporarily aside on the front porch. An unexpected rainfall soaked it, and I could not revive it. Not much later the San Simeon quake, and then the Parkfield quakes each gave my house a good shaking. Would've been nice to know what the local accelerations were. My house sits just off the 101 freeway, just south of San Luis Obispo, on what a geologist has told me is a "stabilized sand dune."

Mike Williams in Arroyo Grande, CA USA