Earthquake with magnitude of ML 1.4 on date 28-09-2021 and time 12:53:37 (Italy) in region 3 km NW Augusta (SR)

A magnitude ML 1.4 earthquake occured in region: 3 km NW Augusta (SR), on

  • 28-09-2021 10:53:37 (UTC)
  • 28-09-2021 12:53:37 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.254, 15.194 at 7 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
Augusta SR 3 36305 36305
Melilli SR 10 13621 49926
Priolo Gargallo SR 10 12091 62017
Carlentini SR 16 17798 79815
Sortino SR 17 8690 88505
Lentini SR 18 24085 112590
Solarino SR 18 8091 120681
Floridia SR 19 22762 143443

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km NW of Siracusa (122291 inhabitants)
29 Km SE of Catania (314555 inhabitants)
40 Km S of Acireale (52622 inhabitants)
55 Km NE of Ragusa (73313 inhabitants)
58 Km NE of Modica (54633 inhabitants)
67 Km NE of Vittoria (63339 inhabitants)
86 Km E of Gela (75827 inhabitants)
Recent and historical seismicity
Seismic hazard
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web 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 1.4 2021-09-28
37.2538 15.194 7 2021-09-28
Sala Sismica INGV-Roma 95987731
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2021-09-28 10:53:37 ± 0.45
Latitude 37.2538 ± 0.0099
Longitude 15.1940 ± 0.0192
Depth (km) 7 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95987731


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1730
Semi-minor axis of confidence ellipse (meter) 756
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 99
Circular confidence region, given by single value of horizontal uncertainty (meter) 1730
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 270
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.1358
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 3
Magnitude information


Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 95987731
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-28 11:12:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ESCV.HHZ. 2021-09-28T10:53:47.17 3.0 positive manual P 0.28 0
IV.ECTS.HHZ. 2021-09-28T10:53:46.31 3.0 undecidable manual P -0.16 0
IV.HCRL.HHZ. 2021-09-28T10:53:43.25 0.3 undecidable manual S 283 0.1313 116 0.12 72
IV.SSY.HHZ. 2021-09-28T10:53:43.08 0.3 undecidable manual S 225 0.1358 115 -0.18 72
IV.SSY.HHZ. 2021-09-28T10:53:41.15 0.3 undecidable manual P 225 0.1358 115 0.32 69
IV.HAGA.HHZ. 2021-09-28T10:53:40.50 0.1 undecidable manual S 315 0.0441 145 0.04 100
IV.HCRL.HHZ. 2021-09-28T10:53:40.58 0.1 undecidable manual P 283 0.1313 116 -0.17 96
IV.HAGA.HHZ. 2021-09-28T10:53:39.14 0.1 undecidable manual P 315 0.0441 145 -0.07 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HAGA.HHN. ML:0 0.000747 0.52 AML other m 2021-09-28T10:53:40.88
IV.HAGA.HHE. ML:0 0.00116 0.66 AML other m 2021-09-28T10:53:40.87
IV.HCRL.HHN. ML:1.4 0.0002475 0.76 AML other m 2021-09-28T10:53:44.66
IV.HCRL.HHE. ML:1.3 0.0002085 0.48 AML other m 2021-09-28T10:53:44.90
IV.SSY.HHN. ML:1.6 0.000386785 0.3968 AML other m 2021-09-28T10:53:44.60
IV.SSY.HHE. ML:1.2 0.00016230485 0.544 AML other m 2021-09-28T10:53:44.03
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download