Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 22-03-2021 and time 05:46:22 (Italy) in region 7 km N Troina (EN)

A magnitude ML 1.6 earthquake occured in region: 7 km N Troina (EN), on

  • 22-03-2021 04:46:22 (UTC)
  • 22-03-2021 05:46:22 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.8520, 14.5910 at 11 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Troina EN 7 9373 9373
Cerami EN 9 2006 11379
San Teodoro ME 10 1403 12782
Capizzi ME 10 3176 15958
Cesarò ME 11 2439 18397
Gagliano Castelferrato EN 16 3593 21990
San Fratello ME 18 3707 25697
Maniace CT 19 3765 29462

Municipalities with at least 50000 inhabitants

An earthquake occurred to
57 Km NW of Acireale (52622 inhabitants)
58 Km NW of Catania (314555 inhabitants)
61 Km NE of Caltanissetta (63360 inhabitants)
92 Km NE of Gela (75827 inhabitants)
93 Km W of Messina (238439 inhabitants)
97 Km W of Reggio di Calabria (183035 inhabitants)
98 Km E of Bagheria (55387 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
Bulletin
Rev1000 		ML 1.6 2021-03-22
04:46:22		 37.8518 14.5913 11 2021-07-12
16:55:12		 Bollettino Sismico Italiano INGV 90514131
Reviewed
Rev100 		ML 1.9 2021-03-22
04:46:20		 37.8618 14.5512 28 2021-03-22
04:54:36		 Sala Sismica INGV-Roma 88365531
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-22 04:46:22 ± 0.14
Latitude 37.8518 ± 0.0135
Longitude 14.5913 ± 0.0285
Depth (km) 11 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 90514131

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2706
Semi-minor axis of confidence ellipse (meter) 993
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 240
Circular confidence region, given by single value of horizontal uncertainty (meter) 2710.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 172
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) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.14209
Epicentral distance of station farthest from the epicenter (degree) 0.41908
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 90514131
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-26 16:39:52

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 88365531
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-22 04:54:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MUCR.HHZ. 2021-03-22T04:46:33.41 0.6 undecidable manual S 49 32.5452 90 -0.01 48
IV.ECTS.HHZ. 2021-03-22T04:46:31.24 1.0 undecidable manual P 86 46.5201 90 0.39 23
IV.ESCV.HHZ. 2021-03-22T04:46:30.85 1.0 undecidable manual S 121 22.8549 90 0.04 25
IV.MSFR.HHZ. 2021-03-22T04:46:30.37 1.0 undecidable manual S 0 20.1687 90 0.25 25
IV.GALF.HHZ. 2021-03-22T04:46:29.20 0.6 undecidable manual S 188 15.7731 90 0.25 49
IV.EMSG.HHZ. 2021-03-22T04:46:28.93 0.6 undecidable manual P 96 31.6461 90 0.37 47
IV.MUCR.HHZ. 2021-03-22T04:46:28.35 0.3 undecidable manual P 49 32.5452 90 -0.36 68
IV.EPZF.HHZ. 2021-03-22T04:46:27.50 0.3 undecidable manual P 97 23.4543 90 0.19 75
IV.MSFR.HHZ. 2021-03-22T04:46:26.86 0.6 undecidable manual P 0 20.1687 90 0.06 50
IV.GALF.HHZ. 2021-03-22T04:46:26.01 0.1 positive manual P 188 15.7731 90 -0.11 100
IV.ESCV.HHZ. 2021-03-22T04:46:26.83 0.3 undecidable manual P 121 22.8549 90 -0.37 70
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ESCV.HHE. ML:1.9 0.0005295 1.46 AML other m 2021-03-22T04:46:31.75
IV.GALF.HHE. ML:1.7 0.00041796144999999994 0.4416 AML other m 2021-03-22T04:46:29.74
IV.GALF.HHN. ML:1.7 0.0004205761 3.9616 AML other m 2021-03-22T04:46:28.66
IV.ESCV.HHN. ML:1.8 0.0004270348000000001 4.1408 AML other m 2021-03-22T04:46:31.43
IV.MSFR.HHN. ML:1.3 0.00013331590000000002 4.0608 AML other m 2021-03-22T04:46:32.05
IV.MSFR.HHE. ML:1.1 0.00008471843 1.2 AML other m 2021-03-22T04:46:29.78
IV.MUCR.HHE. ML:1.5 0.00012764744999999998 2.0416 AML other m 2021-03-22T04:46:34.78
IV.MUCR.HHN. ML:1.5 0.00012307365 2.32 AML other m 2021-03-22T04:46:34.52
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