Earthquake with magnitude of ML 0.5 on date 19-08-2021 and time 01:45:55 (Italy) in region 4 km E Norcia (PG)

A magnitude ML 0.5 earthquake occured in region: 4 km E Norcia (PG), on

  • 18-08-2021 23:45:55 (UTC)
  • 19-08-2021 01:45:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8120, 13.1410 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.

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 4 4957 4957
Castelsantangelo sul Nera MC 9 281 5238
Preci PG 11 724 5962
Arquata del Tronto AP 14 1178 7140
Visso MC 14 1107 8247
Cascia PG 15 3217 11464
Ussita MC 15 444 11908
Accumoli RI 16 667 12575
Montegallo AP 16 523 13098
Montemonaco AP 18 604 13702
Cerreto di Spoleto PG 18 1075 14777
Sellano PG 19 1079 15856

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km E of Foligno (57155 inhabitants)
49 Km NE of Terni (111501 inhabitants)
49 Km W of Teramo (54892 inhabitants)
55 Km NW of L'Aquila (69753 inhabitants)
70 Km E of Perugia (166134 inhabitants)
89 Km W of Montesilvano (53738 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
95 Km E of Viterbo (67173 inhabitants)
96 Km W of Pescara (121014 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
98 Km N of Tivoli (56533 inhabitants)
98 Km NW 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 0.5 2021-08-18
23:45:55
42.8122 13.1412 11 2021-12-29
11:12:28
Bollettino Sismico Italiano INGV 95236001
Reviewed
Rev100
ML 0.6 2021-08-18
23:45:55
42.8047 13.1317 11 2021-08-18
23:57:13
Sala Sismica INGV-Roma 94350761
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-18 23:45:55 ± 0.04
Latitude 42.8122 ± 0.0027
Longitude 13.1412 ± 0.0037
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 95236001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 277
Semi-minor axis of confidence ellipse (meter) 231
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 56
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) 50
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 27
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.02878
Epicentral distance of station farthest from the epicenter (degree) 0.41908
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 94350761
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-18 23:57:13

ML:0.5

Field Value
Value 0.5
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 95236001
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-09 13:37:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MOMA.HNZ. 2021-08-18T23:46:11.11 0.6 undecidable manual S 269 46.5201 50 0.42 43
IV.CSP1.EHZ. 2021-08-18T23:46:06.63 0.6 undecidable manual S 9 31.4463 50 -0.05 48
IV.FDMO.HHZ. 2021-08-18T23:46:05.01 0.3 undecidable manual S 350 25.2525 50 -0.02 73
IV.SMA1.EHZ. 2021-08-18T23:46:05.44 0.6 undecidable manual S 142 25.6521 50 0.31 46
IV.CESI.HHZ. 2021-08-18T23:46:05.97 0.6 undecidable manual S 318 28.749 50 0.01 48
IV.GAVE.HNZ. 2021-08-18T23:46:04.56 0.6 undecidable manual S 237 24.1536 50 -0.16 47
IV.LNSS.HHZ. 2021-08-18T23:46:04.93 0.6 undecidable manual S 200 24.6531 50 0.07 48
IV.T1299.EHZ. 2021-08-18T23:46:04.46 0.6 undecidable manual S 150 22.8549 50 0.08 48
IV.TERO.HHZ. 2021-08-18T23:46:04.06 0.6 undecidable manual P 119 43.2234 50 0.19 45
IV.MOMA.HNZ. 2021-08-18T23:46:04.50 0.1 undecidable manual P 269 46.5201 50 0.11 92
IT.MTCL.HGZ. 2021-08-18T23:46:04.22 0.6 undecidable manual S 330 23.2545 50 -0.26 46
IV.MMO1.EHZ. 2021-08-18T23:46:03.13 0.3 undecidable manual S 57 17.9709 121 0.09 73
IV.MTRA.HNZ. 2021-08-18T23:46:03.62 0.6 undecidable manual S 106 21.6672 50 -0.46 45
IV.CSP1.EHZ. 2021-08-18T23:46:02.26 0.6 positive manual P 9 31.4463 50 0.19 46
IV.MC2.EHZ. 2021-08-18T23:46:01.49 0.3 undecidable manual S 19 11.6772 133 0.19 72
IV.SMA1.EHZ. 2021-08-18T23:46:01.13 0.3 undecidable manual P 142 25.6521 50 -0.04 72
IV.CESI.HHZ. 2021-08-18T23:46:01.64 0.1 undecidable manual P 318 28.749 50 -0.01 97
IV.FDMO.HHZ. 2021-08-18T23:46:01.10 0.3 undecidable manual P 350 25.2525 50 -0.02 73
IV.MTRA.HNZ. 2021-08-18T23:46:00.48 0.1 undecidable manual P 106 21.6672 50 -0.09 96
IT.MTCL.HGZ. 2021-08-18T23:46:00.72 0.1 undecidable manual P 330 23.2545 50 -0.08 96
IV.GAVE.HNZ. 2021-08-18T23:46:00.97 0.1 undecidable manual P 237 24.1536 50 0.03 97
IV.LNSS.HHZ. 2021-08-18T23:46:00.87 0.1 undecidable manual P 200 24.6531 50 -0.15 95
IV.T1299.EHZ. 2021-08-18T23:46:00.75 0.1 undecidable manual P 150 22.8549 50 0.01 98
IV.MC2.EHZ. 2021-08-18T23:45:59.16 0.3 undecidable manual P 19 11.6772 133 0.19 72
IV.MMO1.EHZ. 2021-08-18T23:45:59.96 0.3 undecidable manual P 57 17.9709 121 -0.01 74
IV.NRCA.HHZ. 2021-08-18T23:45:59.31 0.3 undecidable manual S 318 3.1968 163 -0.38 70
IV.NRCA.HHZ. 2021-08-18T23:45:58.09 0.1 undecidable manual P 318 3.1968 163 0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:0.6 0.0000622 0.08 AML other m 2021-08-18T23:45:59.85
IV.NRCA.HHN. ML:0.5 0.000049250000000000004 1.1 AML other m 2021-08-18T23:46:00.94
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