B737 captain reported that ATC issued a 'low altitude' alert and instructed them to climb.

Attributes
ACN	1531549
Time
Date	201803
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	ATC Issue All Types Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT

Narrative:

While on a left base; approach cleared us to descend to 2;000 ft; I read the clearance back and the pilot flying descended to 2;000 ft. We where the switched to the tower who issued a low altitude alert and instructed us to climb to 2;500 ft as that was the MVA. We complied and landed uneventfully.

Original NASA ASRS Text

Title: B737 Captain reported that ATC issued a 'Low Altitude' alert and instructed them to climb.

Narrative: While on a left base; Approach cleared us to descend to 2;000 FT; I read the clearance back and the Pilot Flying descended to 2;000 FT. We where the switched to the Tower who issued a Low Altitude Alert and instructed us to climb to 2;500 FT as that was the MVA. We complied and landed uneventfully.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.