Earthquake with magnitude of ML 0.5 on date 23-02-2021 and time 00:34:48 (UTC) in region 5 km S Stelvio (BZ)

A magnitude ML 0.5 earthquake occured in region: 5 km S Stelvio (BZ), on

  • 23-02-2021 00:34:48 (UTC)
  • 23-02-2021 01:34:48 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 46.56, 10.53 at 10 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Stelvio BZ 5 1161 1161
Prato allo Stelvio BZ 8 3474 4635
Tubre BZ 11 977 5612
Sluderno BZ 13 1804 7416
Glorenza BZ 13 896 8312
Valfurva SO 14 2638 10950
Lasa BZ 14 3993 14943
Malles Venosta BZ 15 5162 20105
Bormio SO 15 4121 24226
Martello BZ 19 869 25095
Valdisotto SO 19 3556 28651
Valdidentro SO 20 4125 32776

Municipalities with at least 50000 inhabitants

An earthquake occurred to
63 Km W of Bolzano (106441 inhabitants)
71 Km NW of Trento (117317 inhabitants)
Recent and historical Seismicity
Seismic hazard
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire ( that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
ML 0.5 2021-02-23
46.56 10.53 10 2021-02-23
Sala Sismica INGV-Roma 87395421
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2021-02-23 00:34:48 ± 0.15
Latitude 46.56 ± 0.01
Longitude 10.53 ± 0.01
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87395421


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1317
Semi-minor axis of confidence ellipse (meter) 320
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 124
Circular confidence region, given by single value of horizontal uncertainty (meter) 1320
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 221
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.37861
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information


Field Value
Value 0.5
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 87395421
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-23 00:46:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
CH.BERNI.HHZ. 2021-02-23T00:35:01.94 0.3 undecidable manual S 248 0.3786 50 -0.11 70
CH.BERNI.HHZ. 2021-02-23T00:34:56.19 0.6 negative manual P 248 0.3786 50 0.06 47
IV.BRMO.HHZ. 2021-02-23T00:34:54.14 0.3 undecidable manual S 234 0.1367 122 -0.13 73
CH.FUORN.HHZ. 2021-02-23T00:34:53.00 0.6 positive manual P 0.09 0.86
SI.MOSI.HHZ. 2021-02-23T00:34:52.06 0.3 undecidable manual S 10 0.0612 145 -0.05 75
IV.BRMO.HHZ. 2021-02-23T00:34:51.72 0.1 positive manual P 234 0.1367 122 0.09 98
IV.BORM.HNE. 2021-02-23T00:34:51.72 0.1 undecidable manual P 231 0.1385 122 0.05 98
SI.MOSI.HHZ. 2021-02-23T00:34:50.34 0.1 negative manual P 10 0.0612 145 -0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
SI.MOSI.HHE. ML:0.6 5.8254715E-5 0.74 AML other m 2021-02-23T00:34:52.45
SI.MOSI.HHN. ML:0.7 8.138581E-5 0.98 AML other m 2021-02-23T00:34:52.68
IV.BRMO.HHN. ML:0.3 1.7728685E-5 0.14 AML other m 2021-02-23T00:34:54.51
IV.BRMO.HHE. ML:0.4 2.26889407E-5 0.18 AML other m 2021-02-23T00:34:54.44
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download