Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 01-05-2021 and time 05:10:32 (Italy) in region 5 km SE Norcia (PG)

A magnitude ML 0.9 earthquake occured in region: 5 km SE Norcia (PG), on

  • 01-05-2021 03:10:32 (UTC)
  • 01-05-2021 05:10:32 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7470, 13.1160 at 9 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
Norcia PG 5 4957 4957
Cascia PG 9 3217 8174
Accumoli RI 12 667 8841
Cittareale RI 15 482 9323
Poggiodomo PG 15 117 9440
Arquata del Tronto AP 15 1178 10618
Preci PG 16 724 11342
Castelsantangelo sul Nera MC 17 281 11623
Monteleone di Spoleto PG 17 599 12222
Cerreto di Spoleto PG 18 1075 13297
Amatrice RI 19 2657 15954

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km SE of Foligno (57155 inhabitants)
44 Km E of Terni (111501 inhabitants)
49 Km W of Teramo (54892 inhabitants)
50 Km NW of L'Aquila (69753 inhabitants)
71 Km SE of Perugia (166134 inhabitants)
89 Km W of Montesilvano (53738 inhabitants)
89 Km NE of Guidonia Montecelio (88673 inhabitants)
90 Km E of Viterbo (67173 inhabitants)
91 Km N of Tivoli (56533 inhabitants)
95 Km W of Pescara (121014 inhabitants)
97 Km W of Chieti (51815 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 2021-05-01
03:10:32		 42.7473 13.1155 9 2021-12-29
11:12:07		 Bollettino Sismico Italiano INGV 91816971
Reviewed
Rev100 		ML 0.9 2021-05-01
03:10:32		 42.7457 13.1092 4 2021-05-01
06:54:04		 Sala Sismica INGV-Roma 89652571
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-01 03:10:32 ± 0.04
Latitude 42.7473 ± 0.0018
Longitude 13.1155 ± 0.0037
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 91816971

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 283
Semi-minor axis of confidence ellipse (meter) 145
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 246
Circular confidence region, given by single value of horizontal uncertainty (meter) 280.0
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 32
Number of defining phases 32
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) 0.08633
Epicentral distance of station farthest from the epicenter (degree) 0.55848
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 89652571
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-05-01 06:54:04

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 91816971
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-07 14:38:11
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MML1.EHE. 2021-05-01T03:10:47.21 0.6 undecidable manual S 344 42.2244 50 0.37 45
IV.SAP2.EHN. 2021-05-01T03:10:47.84 1.0 undecidable manual S 31 45.1215 50 0.24 23
IV.MF5.EHN. 2021-05-01T03:10:46.08 1.0 undecidable manual S 46 38.628 50 0.2 23
IV.TERO.HHN. 2021-05-01T03:10:46.46 0.6 undecidable manual S 109 42.1245 50 -0.36 45
IV.CSP1.EHZ. 2021-05-01T03:10:45.73 0.6 undecidable manual S 11 38.9277 50 -0.22 47
IV.FDMO.HHZ. 2021-05-01T03:10:44.42 1.0 undecidable manual S 356 32.1456 105 0.32 23
IV.CESI.HHE. 2021-05-01T03:10:44.27 1.0 undecidable manual S 329 33.3444 50 -0.19 24
IV.ATCC.EHE. 2021-05-01T03:10:43.82 1.0 undecidable manual P 322 61.9935 50 -0.03 23
IV.RM33.EHE. 2021-05-01T03:10:42.68 0.3 undecidable manual S 163 27.6501 107 0.08 73
IV.SAP2.EHN. 2021-05-01T03:10:41.17 1.0 undecidable manual P 31 45.1215 50 -0.07 24
IV.ASSB.HHN. 2021-05-01T03:10:41.78 1.0 undecidable manual P 312 49.5171 50 -0.14 23
IV.MMO1.EHZ. 2021-05-01T03:10:41.34 0.6 undecidable manual S 45 24.0537 110 -0.09 49
IV.CSP1.EHZ. 2021-05-01T03:10:40.32 0.1 undecidable manual P 11 38.9277 50 0.03 97
IT.FOPC.HGN. 2021-05-01T03:10:40.60 1.0 undecidable manual P 306 41.625 50 -0.11 24
IV.MTRA.EHZ. 2021-05-01T03:10:40.73 0.3 undecidable manual S 87 22.9548 111 -0.32 70
IV.MF5.EHN. 2021-05-01T03:10:40.54 0.6 undecidable manual P 46 38.628 50 0.29 46
IV.SMA1.EHZ. 2021-05-01T03:10:40.93 0.3 undecidable manual S 126 22.1556 111 0.14 73
IV.MML1.EHE. 2021-05-01T03:10:40.86 0.6 undecidable manual P 344 42.2244 50 0.05 48
IV.TERO.HHN. 2021-05-01T03:10:40.88 1.0 undecidable manual P 109 42.1245 50 0.09 24
IV.CESI.HHE. 2021-05-01T03:10:39.36 1.0 undecidable manual P 329 33.3444 50 -0.07 24
IV.T1299.HNZ. 2021-05-01T03:10:39.72 0.3 undecidable manual S 133 18.4704 115 0.09 74
IV.LNSS.HHN. 2021-05-01T03:10:39.08 0.6 undecidable manual S 201 17.1717 117 -0.14 49
IV.RM33.EHE. 2021-05-01T03:10:38.38 0.6 undecidable manual P 163 27.6501 107 0.02 49
IV.FDMO.HHZ. 2021-05-01T03:10:38.95 0.1 undecidable manual P 356 32.1456 105 -0.27 93
IV.SMA1.EHZ. 2021-05-01T03:10:37.53 0.1 undecidable manual P 126 22.1556 111 0.22 96
IV.MMO1.EHZ. 2021-05-01T03:10:37.71 0.3 undecidable manual P 45 24.0537 110 0.03 74
IV.NRCA.HHZ. 2021-05-01T03:10:37.06 0.3 undecidable manual S 359 9.5793 132 0.05 76
IV.MTRA.EHZ. 2021-05-01T03:10:37.31 0.1 undecidable manual P 87 22.9548 111 -0.15 97
IV.GAVE.EHN. 2021-05-01T03:10:36.80 1.0 undecidable manual P 251 19.0698 114 0.06 25
IV.LNSS.HHN. 2021-05-01T03:10:36.21 0.1 undecidable manual P 201 17.1717 117 -0.19 97
IV.T1299.HNZ. 2021-05-01T03:10:36.82 0.3 undecidable manual P 133 18.4704 115 0.18 73
IV.NRCA.HHZ. 2021-05-01T03:10:35.25 0.1 undecidable manual P 359 9.5793 132 0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:0.7 0.00006847126000000001 1.0592 AML other m 2021-05-01T03:10:37.42
IV.NRCA.HNE. ML:1.1 0.00019587925000000002 2.1408 AML other m 2021-05-01T03:10:37.53
IV.NRCA.HNN. ML:1.1 0.00018271795 1.2416 AML other m 2021-05-01T03:10:38.51
IV.NRCA.HHE. ML:1.0 0.00014950000000000003 0.1 AML other m 2021-05-01T03:10:37.89
IV.SMA1.EHN. ML:0.8 0.000044999999999999996 0.4 AML other m 2021-05-01T03:10:41.53
IV.SMA1.EHE. ML:0.8 0.000043700000000000005 1.68 AML other m 2021-05-01T03:10:42.11
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