Earthquake with magnitude of ML 0.8 on date 22-08-2021 and time 14:57:35 (Italy) in region 3 km SW Norcia (PG)

A magnitude ML 0.8 earthquake occured in region: 3 km SW Norcia (PG), on

  • 22-08-2021 12:57:35 (UTC)
  • 22-08-2021 14:57:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.77, 13.08 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 3 4957 4957
Cascia PG 8 3217 8174
Preci PG 13 724 8898
Poggiodomo PG 13 117 9015
Cerreto di Spoleto PG 14 1075 10090
Castelsantangelo sul Nera MC 15 281 10371
Accumoli RI 16 667 11038
Monteleone di Spoleto PG 17 599 11637
Vallo di Nera PG 18 364 12001
Arquata del Tronto AP 18 1178 13179
Visso MC 18 1107 14286
Cittareale RI 18 482 14768
Sellano PG 18 1079 15847

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km SE of Foligno (57155 inhabitants)
42 Km NE of Terni (111501 inhabitants)
53 Km W of Teramo (54892 inhabitants)
53 Km NW of L'Aquila (69753 inhabitants)
68 Km SE of Perugia (166134 inhabitants)
89 Km E of Viterbo (67173 inhabitants)
90 Km NE of Guidonia Montecelio (88673 inhabitants)
92 Km W of Montesilvano (53738 inhabitants)
93 Km N of Tivoli (56533 inhabitants)
99 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 2021-08-22
12:57:35
42.7698 13.0797 11 2021-08-22
13:12:15
Sala Sismica INGV-Roma 94499341
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-22 12:57:35 ± 0.1
Latitude 42.7698 ± 0.0036
Longitude 13.0797 ± 0.0147
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 94499341

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1245
Semi-minor axis of confidence ellipse (meter) 335
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 93
Circular confidence region, given by single value of horizontal uncertainty (meter) 1250
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 130
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.37502
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 94499341
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-22 13:12:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.VVLD.HHZ. 2021-08-22T12:58:05.80 3.0 undecidable manual S -0.22 0
IV.MURB.HNZ. 2021-08-22T12:57:51.08 3.0 undecidable manual P 0.18 0
IV.ATCC.EHZ. 2021-08-22T12:57:46.63 3.0 negative manual P -2.16 0
IV.FDMO.HHZ. 2021-08-22T12:57:46.06 0.1 undecidable manual S 1 0.2662 50 -0.12 97
IV.RM33.EHZ. 2021-08-22T12:57:46.46 0.1 undecidable manual S 159 0.2788 50 -0.09 98
IV.MC2.EHZ. 2021-08-22T12:57:43.24 0.1 undecidable manual S 29 0.1628 121 0.22 97
IV.MOMA.HHZ. 2021-08-22T12:57:43.86 1.0 undecidable manual P 275 0.375 50 0.23 23
IV.FDMO.HHZ. 2021-08-22T12:57:41.97 1.0 undecidable manual P 1 0.2662 50 0.2 24
IV.CESI.HHZ. 2021-08-22T12:57:41.98 3.0 undecidable manual P 0
IV.RM33.EHZ. 2021-08-22T12:57:41.97 0.3 undecidable manual P 159 0.2788 50 -0.01 74
IV.LNSS.HHN. 2021-08-22T12:57:40.15 0.1 undecidable manual P 190 0.1691 120 0.08 100
IV.MC2.EHZ. 2021-08-22T12:57:40.25 0.6 positive manual P 29 0.1628 121 0.31 48
IV.NRCA.HHZ. 2021-08-22T12:57:39.94 0.1 undecidable manual S 22 0.0683 145 -0.35 96
IV.NRCA.HHZ. 2021-08-22T12:57:38.38 0.6 undecidable manual P 22 0.0683 145 0.01 52
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.3 0.0002925 0.16 AML other m 2021-08-22T12:57:40.10
IV.NRCA.HHN. ML:1.1 0.0001635 1.62 AML other m 2021-08-22T12:57:40.99
IV.RM33.EHN. ML:0.6 1.79E-5 0.26 AML other m 2021-08-22T12:57:46.60
IV.FDMO.HHE. ML:0.6 2.085E-5 0.46 AML other m 2021-08-22T12:57:46.43
IV.FDMO.HHN. ML:0.5 1.65E-5 0.66 AML other m 2021-08-22T12:57:46.73
IV.RM33.EHE. ML:0.8 2.93E-5 0.14 AML other m 2021-08-22T12:57:47.72
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