Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 31-01-2021 and time 02:52:54 (UTC) in region 3 km NW Sperlinga (EN)

A magnitude ML 1.3 earthquake occured in region: 3 km NW Sperlinga (EN), on

  • 31-01-2021 02:52:54 (UTC)
  • 31-01-2021 03:52:54 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.7900, 14.3410 at 11 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Sperlinga EN 3 805 805
Nicosia EN 7 13899 14704
Castel di Lucio ME 11 1294 15998
Gangi PA 12 6811 22809
Capizzi ME 14 3176 25985
Cerami EN 15 2006 27991
Mistretta ME 16 4791 32782
Leonforte EN 17 13439 46221
Nissoria EN 18 3000 49221
Geraci Siculo PA 18 1945 51166
San Mauro Castelverde PA 19 1701 52867
Gagliano Castelferrato EN 19 3593 56460
Assoro EN 19 5191 61651

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km NE of Caltanissetta (63360 inhabitants)
73 Km W of Catania (314555 inhabitants)
75 Km W of Acireale (52622 inhabitants)
80 Km E of Bagheria (55387 inhabitants)
81 Km N of Gela (75827 inhabitants)
85 Km NE of Agrigento (59770 inhabitants)
93 Km E of Palermo (674435 inhabitants)
95 Km N of Vittoria (63339 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.3 2021-01-31
02:52:54		 37.7902 14.3408 11 2021-01-31
03:02:42		 Sala Sismica INGV-Roma 86729291
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-31 02:52:54 ± 0.13
Latitude 37.7902 ± 0.0135
Longitude 14.3408 ± 0.0102
Depth (km) 11 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86729291

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1590
Semi-minor axis of confidence ellipse (meter) 770
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 18
Circular confidence region, given by single value of horizontal uncertainty (meter) 1590.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 95
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.33
Epicentral distance of station closest to the epicenter (degree) 0.18346
Epicentral distance of station farthest from the epicenter (degree) 0.49013
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 86729291
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-31 03:02:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSLB.HHZ. 2021-01-31T02:53:05.81 0.6 undecidable manual S 304 29.6481 50 0.47 47
IV.MUCR.HHZ. 2021-01-31T02:53:05.04 0.1 undecidable manual P 59 54.4011 50 0.3 93
IV.PETRA.HHZ. 2021-01-31T02:53:03.27 0.3 undecidable manual S 284 20.3685 50 0.42 72
IV.GALF.HHZ. 2021-01-31T02:53:03.08 0.6 undecidable manual S 114 21.6672 50 -0.11 51
IV.MSFR.HHE. 2021-01-31T02:53:01.55 0.3 undecidable manual P 39 34.8429 50 -0.17 74
IV.CAGR.HHE. 2021-01-31T02:53:00.54 0.3 undecidable manual P 143 23.2545 50 0.6 68
IV.CSLB.HHZ. 2021-01-31T02:53:00.25 1.0 undecidable manual P 304 29.6481 50 -0.67 22
IV.RESU.HHE. 2021-01-31T02:53:00.47 0.6 undecidable manual P 238 29.5482 50 -0.43 47
IV.PLLN.EHZ. 2021-01-31T02:53:00.55 0.1 undecidable manual P 322 28.3494 50 -0.17 100
IV.PETRA.HHZ. 2021-01-31T02:52:59.18 0.1 undecidable manual P 284 20.3685 50 -0.31 98
IV.GALF.HHZ. 2021-01-31T02:52:59.42 0.3 negative manual P 114 21.6672 50 -0.27 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PETRA.HHN. ML:1.2 0.00010889999999999999 0.66 AML other m 2021-01-31T02:53:05.62
IV.GALF.HHE. ML:1.8 0.0004505 0.78 AML other m 2021-01-31T02:53:07.47
IV.GALF.HHN. ML:1.9 0.000509 0.62 AML other m 2021-01-31T02:53:09.32
IV.PETRA.HHE. ML:1.4 0.0001675 0.52 AML other m 2021-01-31T02:53:11.01
IV.CSLB.HHE. ML:0.9 0.000033909265 0.28 AML other m 2021-01-31T02:53:06.79
IV.CSLB.HHN. ML:1.1 0.00006489539 1.48 AML other m 2021-01-31T02:53:08.63
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download