Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.5 on date 04-05-2021 and time 23:07:22 (UTC) in region 5 km E Monteleone di Spoleto (PG)

A magnitude ML 0.5 earthquake occured in region: 5 km E Monteleone di Spoleto (PG), on

  • 04-05-2021 23:07:22 (UTC)
  • 05-05-2021 01:07:22 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6340, 13.0070 at 10 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
Monteleone di Spoleto PG 5 599 599
Leonessa RI 9 2435 3034
Cascia PG 10 3217 6251
Poggiodomo PG 11 117 6368
Cittareale RI 13 482 6850
Polino TR 14 233 7083
Posta RI 14 694 7777
Scheggino PG 17 461 8238
Borbona RI 17 617 8855
Poggio Bustone RI 18 2055 10910
Sant'Anatolia di Narco PG 18 564 11474
Ferentillo TR 18 1913 13387
Rivodutri RI 18 1253 14640
Morro Reatino RI 19 373 15013
Norcia PG 19 4957 19970
Vallo di Nera PG 19 364 20334

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km E of Terni (111501 inhabitants)
44 Km SE of Foligno (57155 inhabitants)
45 Km NW of L'Aquila (69753 inhabitants)
57 Km W of Teramo (54892 inhabitants)
73 Km SE of Perugia (166134 inhabitants)
74 Km NE of Guidonia Montecelio (88673 inhabitants)
76 Km N of Tivoli (56533 inhabitants)
78 Km E of Viterbo (67173 inhabitants)
93 Km NE of Roma (2864731 inhabitants)
95 Km W of Montesilvano (53738 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 0.5 2021-05-04
23:07:22		 42.6342 13.0072 10 2021-12-29
11:12:25		 Bollettino Sismico Italiano INGV 94956471
Reviewed
Rev100 		ML 0.5 2021-05-04
23:07:22		 42.6207 13.0012 10 2021-05-04
23:14:48		 Sala Sismica INGV-Roma 89779711
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-04 23:07:22 ± 0.11
Latitude 42.6342 ± 0.0054
Longitude 13.0072 ± 0.0061
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 94956471

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 528
Semi-minor axis of confidence ellipse (meter) 406
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 221
Circular confidence region, given by single value of horizontal uncertainty (meter) 530.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 111
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.24102
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.2
Num. used stations 9
Type of magnitude ML
Reference to an origin 94956471
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-02 11:13:49

ML:0.5

Field Value
Value 0.5
Uncertainty 0.2
Num. used stations 9
Type of magnitude ML
Reference to an origin 89779711
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-05-04 23:14:48
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TREG.EHZ. 2021-05-04T23:08:47.15 3.0 undecidable manual Sn -1.63 0
IV.SEI.HHZ. 2021-05-04T23:08:26.25 3.0 undecidable manual Sn -0.3 0
IV.VOBA.EHZ. 2021-05-04T23:08:14.62 3.0 negative manual Pg 10.48 0
IV.ATFO.HHZ. 2021-05-04T23:08:10.96 3.0 undecidable manual Sg 10.42 0
SL.LJU.BHZ. 2021-05-04T23:07:49.17 3.0 undecidable manual Pg 1.75 0
IV.LPEL.HHZ. 2021-05-04T23:07:34.21 3.0 undecidable manual S 0.51 0
IV.SMA1.EHE. 2021-05-04T23:07:32.31 0.6 undecidable manual S 91 26.751 50 0.17 48
IV.NRCA.HHZ. 2021-05-04T23:07:31.07 0.6 undecidable manual S 21 23.754 113 -0.18 48
IV.RM33.EHZ. 2021-05-04T23:07:30.30 0.6 undecidable manual S 129 21.867 115 -0.37 47
IV.T1299.EHE. 2021-05-04T23:07:30.84 0.6 undecidable manual S 90 22.4553 114 0.01 50
IX.STN3.HHZ.02 2021-05-04T23:07:29.38 3.0 undecidable manual Pg -0.23 0
IV.SMA1.EHE. 2021-05-04T23:07:28.04 0.6 undecidable manual P 91 26.751 50 0.05 49
IV.GAVE.EHZ. 2021-05-04T23:07:27.56 0.6 undecidable manual S 305 11.2776 132 0.03 51
IV.NRCA.HHZ. 2021-05-04T23:07:27.30 0.1 undecidable manual P 21 23.754 113 -0.17 97
IV.T1299.EHE. 2021-05-04T23:07:27.60 0.3 undecidable manual P 90 22.4553 114 0.37 70
IV.RM33.EHZ. 2021-05-04T23:07:26.84 0.3 undecidable manual P 129 21.867 115 -0.29 71
IV.ARRO.EHZ. 2021-05-04T23:07:26.75 0.3 undecidable manual P 253 20.6682 116 -0.15 73
IV.LNSS.HHZ. 2021-05-04T23:07:26.22 0.3 undecidable manual S 142 4.3956 156 0.12 76
IV.GAVE.EHZ. 2021-05-04T23:07:25.43 0.1 undecidable manual P 305 11.2776 132 0.11 100
IV.LNSS.HHZ. 2021-05-04T23:07:24.70 0.3 undecidable manual P 142 4.3956 156 0.21 74
IV.LRP.EHZ. 2021-05-04T23:07:24.44 3.0 undecidable manual P 0.27 0
IV.FAGN.HHZ. 2021-05-04T23:07:16.83 3.0 negative manual P -3.51 0
IV.LPEL.HHZ. 2021-05-04T23:07:16.14 3.0 undecidable manual P 0.13 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LNSS.HHN. ML:0.7 0.0000892 0.36 AML other m 2021-05-04T23:07:26.31
IV.LNSS.HNE. ML:0.8 0.00010946532 0.128 AML other m 2021-05-04T23:07:26.75
IV.LNSS.HHE. ML:0.8 0.00010922606500000001 0.1408 AML other m 2021-05-04T23:07:26.69
IV.GAVE.EHN. ML:0.4 0.000029049999999999998 0.52 AML other m 2021-05-04T23:07:28.91
IV.GAVE.EHE. ML:0.5 0.00003435 1.84 AML other m 2021-05-04T23:07:29.04
IV.RM33.EHN. ML:0.5 0.00002 0.48 AML other m 2021-05-04T23:07:30.44
IV.NRCA.HHE. ML:0.6 0.000025971754999999998 0.1408 AML other m 2021-05-04T23:07:31.34
IV.RM33.EHE. ML:0.2 0.000011876351999999999 0.1664 AML other m 2021-05-04T23:07:31.65
IV.NRCA.HHN. ML:0.2 0.000008910906 0.1408 AML other m 2021-05-04T23:07:32.51
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