Earthquake with magnitude of ML 0.4 on date 04-08-2021 and time 00:47:51 (Italy) in region 8 km E Norcia (PG)

A magnitude ML 0.4 earthquake occured in region: 8 km E Norcia (PG), on

  • 03-08-2021 22:47:51 (UTC)
  • 04-08-2021 00:47:51 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.77, 13.192 at 11 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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 9 4957 4957
Arquata del Tronto AP 9 1178 6135
Accumoli RI 9 667 6802
Montegallo AP 14 523 7325
Castelsantangelo sul Nera MC 14 281 7606
Cascia PG 16 3217 10823
Cittareale RI 17 482 11305
Amatrice RI 17 2657 13962
Preci PG 17 724 14686
Acquasanta Terme AP 18 2916 17602
Montemonaco AP 18 604 18206
Visso MC 20 1107 19313
Ussita MC 20 444 19757

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km W of Teramo (54892 inhabitants)
45 Km E of Foligno (57155 inhabitants)
49 Km NW of L'Aquila (69753 inhabitants)
50 Km E of Terni (111501 inhabitants)
75 Km SE of Perugia (166134 inhabitants)
83 Km W of Montesilvano (53738 inhabitants)
90 Km W of Pescara (121014 inhabitants)
93 Km NW of Chieti (51815 inhabitants)
94 Km NE of Guidonia Montecelio (88673 inhabitants)
95 Km NE of Tivoli (56533 inhabitants)
97 Km E of Viterbo (67173 inhabitants)
98 Km S of Ancona (100861 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.4 2021-08-03
22:47:51
42.7698 13.1923 11 2021-08-03
22:56:08
Sala Sismica INGV-Roma 93639411
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-03 22:47:51 ± 0.08
Latitude 42.7698 ± 0.0036
Longitude 13.1923 ± 0.0074
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 93639411

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 543
Semi-minor axis of confidence ellipse (meter) 291
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 70
Circular confidence region, given by single value of horizontal uncertainty (meter) 540
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 67
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.33635
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 15
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 93639411
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-03 22:56:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IT.FIE.HGZ. 2021-08-03T22:48:26.70 3.0 undecidable manual Pg 3.7 0
IV.MURB.HHZ. 2021-08-03T22:48:18.40 3.0 undecidable manual S -0.26 0
IV.SACS.HHZ. 2021-08-03T22:48:12.02 3.0 undecidable manual P 0.17 0
IV.SRES.HHZ. 2021-08-03T22:48:05.60 3.0 undecidable manual P -2.12 0
IV.RM33.EHZ. 2021-08-03T22:48:01.44 0.3 undecidable manual S 176 0.2617 91 -0.32 81
IV.FDMO.HHZ. 2021-08-03T22:48:01.90 0.6 undecidable manual S 344 0.277 91 -0.33 54
IV.SMA1.EHZ. 2021-08-03T22:47:59.02 0.6 undecidable manual S 143 0.1745 93 -0.16 56
IV.LNSS.HHZ. 2021-08-03T22:47:59.83 0.3 undecidable manual S 214 0.2005 92 -0.14 86
IV.MTRA.HNZ. 2021-08-03T22:47:58.13 0.3 undecidable manual S 95 0.1502 95 -0.34 81
IV.T1299.HNZ. 2021-08-03T22:47:58.70 0.6 undecidable manual S 154 0.1511 95 0.22 56
IV.MC2.EHZ. 2021-08-03T22:47:58.45 0.6 undecidable manual S 359 0.1412 97 0.25 56
IV.MF5.EHZ. 2021-08-03T22:47:58.44 0.3 undecidable manual P 42 0.2932 91 0.46 79
IV.GUMA.HNE. 2021-08-03T22:47:58.57 0.3 undecidable manual P 20 0.3103 91 0.28 81
IV.TERO.HHZ. 2021-08-03T22:47:58.59 0.3 undecidable manual P 116 0.3363 91 -0.13 82
IV.CSP1.EHZ. 2021-08-03T22:47:58.48 0.3 undecidable manual P 2 0.322 91 0 85
IV.FDMO.HHZ. 2021-08-03T22:47:57.65 0.3 undecidable manual P 344 0.277 91 -0.07 85
IV.RM33.EHZ. 2021-08-03T22:47:57.70 0.3 undecidable manual P 176 0.2617 91 0.26 82
IV.GAVE.HNZ. 2021-08-03T22:47:57.26 0.3 undecidable manual P 251 0.232 91 0.31 81
IV.NRCA.HHZ. 2021-08-03T22:47:56.49 0.6 undecidable manual S 318 0.0854 125 -0.17 58
IV.LNSS.HHZ. 2021-08-03T22:47:56.54 0.3 undecidable manual P 214 0.2005 92 0.13 85
IT.MTCL.HGN. 2021-08-03T22:47:56.89 0.1 undecidable manual P 328 0.2644 91 -0.61 100
IV.FEMA.HNZ. 2021-08-03T22:47:56.69 0.3 undecidable manual P 332 0.2185 92 -0.03 87
IV.SMA1.EHZ. 2021-08-03T22:47:55.91 0.3 undecidable manual P 143 0.1745 93 -0.05 87
IV.MTRA.HNZ. 2021-08-03T22:47:55.48 0.3 undecidable manual P 95 0.1502 95 -0.07 86
IV.T1299.HNZ. 2021-08-03T22:47:55.73 0.3 undecidable manual P 154 0.1511 95 0.17 85
IV.MC2.EHZ. 2021-08-03T22:47:55.55 0.3 undecidable manual P 359 0.1412 97 0.15 86
IV.NRCA.HHZ. 2021-08-03T22:47:54.69 0.3 undecidable manual P 318 0.0854 125 0.18 86
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.1 0.00014969139 0.0896 AML other m 2021-08-03T22:47:56.79
IV.NRCA.HHN. ML:1 0.000112 0.12 AML other m 2021-08-03T22:47:57.05
IV.SMA1.EHN. ML:0.3 1.6617341E-5 0.1792 AML other m 2021-08-03T22:47:59.62
IV.SMA1.EHE. ML:0.5 2.68E-5 1.36 AML other m 2021-08-03T22:48:00.11
IV.FDMO.HHN. ML:0.5 1.375E-5 0.36 AML other m 2021-08-03T22:48:02.38
IV.FDMO.HHE. ML:0.3 1.245E-5 0.54 AML other m 2021-08-03T22:48:03.52
IV.NRCA.HNE. ML:1.1 0.00013815004 0.0768 AML other m 2021-08-03T22:47:56.79
IV.NRCA.HNN. ML:1 0.000119404725 0.448 AML other m 2021-08-03T22:47:56.20
IV.RM33.EHE. ML:0.5 1.4368815E-5 0.1408 AML other m 2021-08-03T22:48:02.88
IV.RM33.EHN. ML:0.5 1.659855E-5 0.1024 AML other m 2021-08-03T22:48:02.92
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