Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 18-01-2021 and time 02:27:18 (UTC) in region 4 km N Sperlinga (EN)

A magnitude ML 1.9 earthquake occured in region: 4 km N Sperlinga (EN), on

  • 18-01-2021 02:27:18 (UTC)
  • 18-01-2021 03:27:18 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.8, 14.34 at 5 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 4 805 805
Nicosia EN 8 13899 14704
Castel di Lucio ME 10 1294 15998
Gangi PA 12 6811 22809
Capizzi ME 13 3176 25985
Mistretta ME 15 4791 30776
Cerami EN 15 2006 32782
Geraci Siculo PA 18 1945 34727
San Mauro Castelverde PA 18 1701 36428
Leonforte EN 19 13439 49867
Nissoria EN 19 3000 52867
Pettineo ME 19 1350 54217
Reitano ME 19 806 55023
Gagliano Castelferrato EN 20 3593 58616

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km NE of Caltanissetta (63360 inhabitants)
74 Km W of Catania (314555 inhabitants)
76 Km W of Acireale (52622 inhabitants)
79 Km E of Bagheria (55387 inhabitants)
82 Km N of Gela (75827 inhabitants)
86 Km NE of Agrigento (59770 inhabitants)
93 Km E of Palermo (674435 inhabitants)
96 Km N of Vittoria (63339 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
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 (http://www.haisentitoilterremoto.it/) 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
Reviewed
Rev100 		ML 1.9 2021-01-18
02:27:18		 37.8 14.34 5 2021-01-18
02:54:39		 Sala Sismica INGV-Roma 86343541
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-18 02:27:18 ± 0.14
Latitude 37.80 ± 0.01
Longitude 14.34 ± 0.01
Depth (km) 5 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86343541

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1077
Semi-minor axis of confidence ellipse (meter) 658
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 19
Circular confidence region, given by single value of horizontal uncertainty (meter) 1080
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 99
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.39
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.86785
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.4
Num. used stations 10
Type of magnitude ML
Reference to an origin 86343541
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-18 02:54:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.AIO.HHE. 2021-01-18T02:27:44.31 1.0 undecidable manual S 76 0.7231 50 0.78 18
IV.HVZN.HHE. 2021-01-18T02:27:42.68 0.6 undecidable manual S 154 0.6907 50 0.13 45
IV.MUCR.HHE. 2021-01-18T02:27:36.31 0.6 undecidable manual S 60 0.4838 50 -0.13 47
IV.MPNC.HHE. 2021-01-18T02:27:35.88 0.3 undecidable manual P 66 0.8678 50 0.52 60
IV.CORL.HHE. 2021-01-18T02:27:34.35 0.3 undecidable manual P 277 0.8238 50 -0.26 64
IV.HVZN.HHE. 2021-01-18T02:27:32.34 0.6 undecidable manual P 154 0.6907 50 0.02 46
IV.SOLUN.HHE. 2021-01-18T02:27:32.58 0.3 undecidable manual P 295 0.7006 50 0.09 68
IV.AIO.HHE. 2021-01-18T02:27:32.19 0.3 undecidable manual P 76 0.7231 50 -0.69 57
IV.GIB.HHE. 2021-01-18T02:27:30.89 0.6 undecidable manual S 307 0.3121 99 0.4 46
IV.RAFF.HHE. 2021-01-18T02:27:30.27 0.1 undecidable manual P 178 0.5792 50 -0.15 92
IV.PLLN.EHZ. 2021-01-18T02:27:28.38 0.6 undecidable manual S 321 0.2464 101 0.38 47
IV.MUCR.HHE. 2021-01-18T02:27:28.22 0.3 undecidable manual P 60 0.4838 50 -0.57 63
IV.EPZF.HHE. 2021-01-18T02:27:28.08 0.1 undecidable manual P 87 0.4074 97 0.62 85
IV.ESCV.HHZ. 2021-01-18T02:27:27.96 3.0 undecidable manual P 0
IV.PETRA.HHZ. 2021-01-18T02:27:25.69 0.3 undecidable manual S 280 0.1817 104 0.12 75
IV.GIB.HHE. 2021-01-18T02:27:25.81 0.1 undecidable manual P 307 0.3121 99 0.46 91
IV.CAGR.HHZ. 2021-01-18T02:27:24.06 0.3 undecidable manual P 145 0.2194 102 0.74 63
IV.CSLB.HHZ. 2021-01-18T02:27:23.51 0.1 undecidable manual P 301 0.2617 100 -0.74 82
IV.PLLN.EHZ. 2021-01-18T02:27:23.69 0.3 undecidable manual P 321 0.2464 101 -0.23 72
IV.GALF.HHZ. 2021-01-18T02:27:22.46 0.1 undecidable manual P 117 0.1996 103 -0.44 93
IV.PETRA.HHZ. 2021-01-18T02:27:22.40 0.1 undecidable manual P 280 0.1817 104 -0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PLLN.EHE. ML:2 0.0006415 0.74 AML other m 2021-01-18T02:27:29.60
IV.PLLN.EHN. ML:2.2 0.000975 0.48 AML other m 2021-01-18T02:27:30.60
IV.GALF.HNE. ML:1.5 0.0002366644 0.7504 AML other m 2021-01-18T02:27:30.64
IV.GALF.HHN. ML:2.6 0.002695 0.68 AML other m 2021-01-18T02:27:30.38
IV.PETRA.HHN. ML:1.9 0.000655 1.32 AML other m 2021-01-18T02:27:30.76
IV.GALF.HHE. ML:2.5 0.002475 0.62 AML other m 2021-01-18T02:27:32.46
IV.GALF.HNN. ML:1.8 0.000454 0.74 AML other m 2021-01-18T02:27:32.48
IV.PETRA.HHE. ML:1.8 0.0005575 0.7 AML other m 2021-01-18T02:27:34.60
IV.CSLB.HHE. ML:1.4 0.000124164015 0.2992 AML other m 2021-01-18T02:27:31.23
IV.CSLB.HHN. ML:1.4 0.0001239176 0.2208 AML other m 2021-01-18T02:27:31.81
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download