Earthquake with magnitude of ML 0.8 on date 21-09-2021 and time 05:38:30 (UTC) in region 1 km NE Norcia (PG)

A magnitude ML 0.8 earthquake occured in region: 1 km NE Norcia (PG), on

  • 21-09-2021 05:38:30 (UTC)
  • 21-09-2021 07:38:30 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.798, 13.104 at 10 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 1 4957 4957
Preci PG 11 724 5681
Cascia PG 11 3217 8898
Castelsantangelo sul Nera MC 12 281 9179
Visso MC 15 1107 10286
Cerreto di Spoleto PG 15 1075 11361
Arquata del Tronto AP 16 1178 12539
Accumoli RI 16 667 13206
Ussita MC 17 444 13650
Poggiodomo PG 17 117 13767
Sellano PG 18 1079 14846
Montegallo AP 19 523 15369
Vallo di Nera PG 20 364 15733

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km E of Foligno (57155 inhabitants)
46 Km NE of Terni (111501 inhabitants)
52 Km W of Teramo (54892 inhabitants)
55 Km NW of L'Aquila (69753 inhabitants)
68 Km SE of Perugia (166134 inhabitants)
91 Km W of Montesilvano (53738 inhabitants)
92 Km E of Viterbo (67173 inhabitants)
94 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km N of Tivoli (56533 inhabitants)
97 Km SW of Ancona (100861 inhabitants)
98 Km W of Pescara (121014 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 0.8 2021-09-21
05:38:30
42.7982 13.1038 10 2021-09-21
06:26:45
Sala Sismica INGV-Roma 95686081
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-21 05:38:30 ± 0.04
Latitude 42.7982 ± 0.0018
Longitude 13.1038 ± 0.0037
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95686081

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 288
Semi-minor axis of confidence ellipse (meter) 103
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 266
Circular confidence region, given by single value of horizontal uncertainty (meter) 290
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 89
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.40739
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 13
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.4
Num. used stations 13
Type of magnitude ML
Reference to an origin 95686081
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-21 06:26:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.APEC.HHZ. 2021-09-21T05:39:01.62 3.0 undecidable manual S -0.35 0
IV.TERO.HHZ. 2021-09-21T05:38:44.72 0.3 undecidable manual S 115 0.4074 50 -0.31 68
IV.CSP1.EHZ. 2021-09-21T05:38:42.02 0.3 undecidable manual S 14 0.3022 50 0.08 73
IV.RM33.EHZ. 2021-09-21T05:38:41.80 0.3 undecidable manual S 164 0.3004 50 -0.07 73
IV.CESI.HNZ. 2021-09-21T05:38:40.52 0.1 undecidable manual S 325 0.2527 50 0.06 98
IV.SMA1.EHZ. 2021-09-21T05:38:40.19 0.3 undecidable manual S 135 0.2383 50 0.14 73
IV.FDMO.HHZ. 2021-09-21T05:38:39.87 0.3 undecidable manual S 357 0.2383 50 -0.17 72
IT.MTCL.HGE. 2021-09-21T05:38:39.04 0.1 undecidable manual S 339 0.2095 50 -0.15 97
IV.T1299.HNN. 2021-09-21T05:38:39.38 0.1 undecidable manual S 141 0.2095 50 0.19 96
IV.TERO.HHZ. 2021-09-21T05:38:38.65 1.0 undecidable manual P 115 0.4074 50 -0.18 23
IV.MMO1.EHZ. 2021-09-21T05:38:38.32 0.1 undecidable manual S 58 0.1925 116 -0.27 95
IV.GAVE.HNN. 2021-09-21T05:38:38.37 0.1 undecidable manual S 236 0.1871 117 -0.03 100
IV.LNSS.HHZ. 2021-09-21T05:38:38.63 0.3 undecidable manual S 193 0.2005 115 -0.25 71
IV.CSP1.EHZ. 2021-09-21T05:38:37.15 0.6 positive manual P 14 0.3022 50 0.11 48
IV.RM33.EHZ. 2021-09-21T05:38:36.76 1.0 negative manual P 164 0.3004 50 -0.24 23
IV.MC2.EHZ. 2021-09-21T05:38:36.83 0.1 undecidable manual S 29 0.1295 126 0.33 95
IV.CESI.HNZ. 2021-09-21T05:38:36.20 0.1 undecidable manual P 325 0.2527 50 0.01 99
IV.MMO1.EHZ. 2021-09-21T05:38:35.11 1.0 negative manual P 58 0.1925 116 0 25
IV.GAVE.HNN. 2021-09-21T05:38:35.21 0.1 undecidable manual P 236 0.1871 117 0.21 96
IV.LNSS.HHZ. 2021-09-21T05:38:35.41 1.0 negative manual P 193 0.2005 115 0.13 24
IV.FDMO.HHZ. 2021-09-21T05:38:35.92 0.3 positive manual P 357 0.2383 50 -0.03 74
IT.MTCL.HGE. 2021-09-21T05:38:35.36 0.1 undecidable manual P 339 0.2095 50 -0.1 98
IV.SMA1.EHZ. 2021-09-21T05:38:35.98 1.0 undecidable manual P 135 0.2383 50 0.03 25
IV.T1299.HNN. 2021-09-21T05:38:35.60 0.1 undecidable manual P 141 0.2095 50 0.14 97
IV.MC2.EHZ. 2021-09-21T05:38:34.22 0.3 undecidable manual P 29 0.1295 126 0.32 71
IV.NRCA.HHZ. 2021-09-21T05:38:33.96 0.1 undecidable manual S 12 0.036 159 -0.25 98
IV.NRCA.HHZ. 2021-09-21T05:38:32.67 0.3 undecidable manual P 12 0.036 159 0.09 76
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNN. ML:1.7 0.0009325 0.06 AML other m 2021-09-21T05:38:34.06
IV.NRCA.HHN. ML:1.8 0.001106268 0.08 AML other m 2021-09-21T05:38:34.07
IV.NRCA.HNE. ML:1.8 0.0009496706 0.08 AML other m 2021-09-21T05:38:34.03
IV.NRCA.HHE. ML:1.8 0.0009689157 0.08 AML other m 2021-09-21T05:38:34.16
IV.TERO.HHN. ML:0.5 1.1566421E-5 0.0608 AML other m 2021-09-21T05:38:45.86
IV.LNSS.HHE. ML:0.9 5.100096E-5 0.0992 AML other m 2021-09-21T05:38:39.21
IV.LNSS.HHN. ML:0.8 4.470997E-5 0.1792 AML other m 2021-09-21T05:38:39.51
IV.FDMO.HHE. ML:0.6 1.8443745E-5 0.0992 AML other m 2021-09-21T05:38:40.28
IV.FDMO.HHN. ML:0.6 2.0352985E-5 0.0992 AML other m 2021-09-21T05:38:40.24
IV.SMA1.EHE. ML:0.6 2.0612089E-5 0.16 AML other m 2021-09-21T05:38:41.75
IV.SMA1.EHN. ML:0.7 2.75026E-5 0.16 AML other m 2021-09-21T05:38:40.71
IV.RM33.EHE. ML:0.6 1.332611E-5 0.08 AML other m 2021-09-21T05:38:43.08
IV.RM33.EHN. ML:0.6 1.5702165E-5 0.16 AML other m 2021-09-21T05:38:42.13
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