Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 18-04-2021 and time 06:59:37 (Italy) in region 3 km W Preci (PG)

A magnitude ML 0.9 earthquake occured in region: 3 km W Preci (PG), on

  • 18-04-2021 04:59:37 (UTC)
  • 18-04-2021 06:59:37 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8800, 12.9970 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Preci PG 4 724 724
Sellano PG 6 1079 1803
Cerreto di Spoleto PG 9 1075 2878
Visso MC 10 1107 3985
Norcia PG 12 4957 8942
Monte Cavallo MC 13 145 9087
Castelsantangelo sul Nera MC 13 281 9368
Ussita MC 14 444 9812
Vallo di Nera PG 16 364 10176
Cascia PG 18 3217 13393
Pieve Torina MC 19 1458 14851
Campello sul Clitunno PG 19 2442 17293
Fiordimonte MC 19 202 17495
Poggiodomo PG 19 117 17612

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km E of Foligno (57155 inhabitants)
46 Km NE of Terni (111501 inhabitants)
56 Km E of Perugia (166134 inhabitants)
63 Km W of Teramo (54892 inhabitants)
67 Km NW of L'Aquila (69753 inhabitants)
89 Km NE of Viterbo (67173 inhabitants)
92 Km SW of Ancona (100861 inhabitants)
100 Km N of Guidonia Montecelio (88673 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 0.9 2021-04-18
04:59:37		 42.8798 12.9972 11 2021-07-12
16:55:11		 Bollettino Sismico Italiano INGV 90084311
Reviewed
Rev100 		ML 0.9 2021-04-18
04:59:37		 42.8793 12.996 11 2021-04-18
05:06:27		 Sala Sismica INGV-Roma 89202641
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-18 04:59:37 ± 0.04
Latitude 42.8798 ± 0.0018
Longitude 12.9972 ± 0.0025
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 90084311

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 225
Semi-minor axis of confidence ellipse (meter) 211
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 72
Circular confidence region, given by single value of horizontal uncertainty (meter) 220.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 55
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.09083
Epicentral distance of station farthest from the epicenter (degree) 0.45596
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 7
Type of magnitude ML
Reference to an origin 90084311
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-14 09:51:10

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 7
Type of magnitude ML
Reference to an origin 89202641
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-18 05:06:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MOMA.HNZ. 2021-04-18T04:59:49.80 0.3 undecidable manual S 257 35.742 50 0.22 70
IV.LNSS.HNZ. 2021-04-18T04:59:48.20 0.6 undecidable manual S 173 30.9468 50 -0.1 48
IV.ASSB.HHN. 2021-04-18T04:59:48.85 0.6 undecidable manual S 303 32.8449 50 0.03 49
IV.MMO1.EHZ. 2021-04-18T04:59:47.18 0.3 undecidable manual S 85 26.8509 50 -0.04 74
IV.CSP1.EHZ. 2021-04-18T04:59:47.87 0.3 undecidable manual S 36 28.9488 50 0.1 73
IV.GAVE.EHZ. 2021-04-18T04:59:46.05 0.3 undecidable manual S 202 22.4553 50 0.02 75
IV.EL6.EHZ. 2021-04-18T04:59:46.98 0.6 undecidable manual P 10 50.616 50 0.18 46
IV.MML1.EHZ. 2021-04-18T04:59:46.86 0.6 undecidable manual S 355 26.0517 50 -0.13 48
IV.FDMO.HHZ. 2021-04-18T04:59:45.00 0.3 undecidable manual S 23 18.87 50 -0.08 74
IV.CESI.HHZ. 2021-04-18T04:59:44.12 0.3 undecidable manual S 332 15.7731 50 -0.14 74
IV.T1299.HNN. 2021-04-18T04:59:44.14 0.6 undecidable manual P 139 35.8419 50 -0.38 45
IV.MC2.EHZ. 2021-04-18T04:59:44.40 0.3 undecidable manual S 77 15.9729 50 0.09 75
IV.MOMA.HNZ. 2021-04-18T04:59:44.31 0.1 undecidable manual P 257 35.742 50 -0.2 94
IV.CSP1.EHZ. 2021-04-18T04:59:43.42 0.1 undecidable manual P 36 28.9488 50 -0.05 98
IT.MTCL.HGZ. 2021-04-18T04:59:43.12 0.3 undecidable manual S 1 12.6762 131 -0.31 72
IV.ASSB.HHN. 2021-04-18T04:59:43.90 0.6 undecidable manual P 303 32.8449 50 -0.17 48
IV.LNSS.HNZ. 2021-04-18T04:59:43.74 0.1 undecidable manual P 173 30.9468 50 -0.03 98
IV.MMO1.EHZ. 2021-04-18T04:59:43.17 0.3 undecidable manual P 85 26.8509 50 0.02 75
IV.NRCA.HHZ. 2021-04-18T04:59:42.75 0.3 undecidable manual S 118 10.7781 136 -0.21 74
IV.FDMO.HHZ. 2021-04-18T04:59:42.04 0.1 undecidable manual P 23 18.87 50 0.13 99
IV.GAVE.EHZ. 2021-04-18T04:59:42.62 0.3 undecidable manual P 202 22.4553 50 0.16 73
IV.FEMA.HNZ. 2021-04-18T04:59:42.84 0.6 undecidable manual S 25 10.0788 138 0.05 50
IV.MML1.EHZ. 2021-04-18T04:59:42.95 0.1 undecidable manual P 355 26.0517 50 -0.06 98
IV.MC2.EHZ. 2021-04-18T04:59:41.62 0.3 undecidable manual P 77 15.9729 50 0.15 74
IT.MTCL.HGZ. 2021-04-18T04:59:41.03 0.3 undecidable manual P 1 12.6762 131 0.07 75
IV.CESI.HHZ. 2021-04-18T04:59:41.63 0.1 undecidable manual P 332 15.7731 50 0.19 98
IV.FEMA.HNZ. 2021-04-18T04:59:40.81 0.3 undecidable manual P 25 10.0788 138 0.22 73
IV.NRCA.HHZ. 2021-04-18T04:59:40.79 0.1 positive manual P 118 10.7781 136 0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:0.7 0.0000544 0.84 AML other m 2021-04-18T04:59:43.60
IV.NRCA.HHN. ML:0.8 0.00006520000000000001 0.92 AML other m 2021-04-18T04:59:44.95
IV.CESI.HHN. ML:1.0 0.00009299302000000001 0.3584 AML other m 2021-04-18T04:59:44.58
IV.FDMO.HHN. ML:1.1 0.00009165 0.14 AML other m 2021-04-18T04:59:45.25
IV.FDMO.HHE. ML:1.2 0.0001187 0.82 AML other m 2021-04-18T04:59:45.20
IV.GAVE.EHE. ML:1.0 0.000059507749999999996 0.9984 AML other m 2021-04-18T04:59:46.37
IV.GAVE.EHN. ML:0.8 0.000039664325 1.2992 AML other m 2021-04-18T04:59:46.25
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