Earthquake with magnitude of ML 0.9 on date 27-07-2021 and time 02:49:31 (Italy) in region 3 km W Norcia (PG)

A magnitude ML 0.9 earthquake occured in region: 3 km W Norcia (PG), on

  • 27-07-2021 00:49:31 (UTC)
  • 27-07-2021 02:49:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.802, 13.062 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
Preci PG 9 724 5681
Cascia PG 10 3217 8898
Cerreto di Spoleto PG 12 1075 9973
Castelsantangelo sul Nera MC 13 281 10254
Poggiodomo PG 14 117 10371
Visso MC 15 1107 11478
Sellano PG 15 1079 12557
Vallo di Nera PG 17 364 12921
Ussita MC 17 444 13365
Monteleone di Spoleto PG 19 599 13964
Accumoli RI 19 667 14631
Arquata del Tronto AP 19 1178 15809
Sant'Anatolia di Narco PG 20 564 16373

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km SE of Foligno (57155 inhabitants)
43 Km NE of Terni (111501 inhabitants)
55 Km W of Teramo (54892 inhabitants)
57 Km NW of L'Aquila (69753 inhabitants)
65 Km SE of Perugia (166134 inhabitants)
89 Km E of Viterbo (67173 inhabitants)
93 Km NE of Guidonia Montecelio (88673 inhabitants)
95 Km W of Montesilvano (53738 inhabitants)
96 Km N of Tivoli (56533 inhabitants)
98 Km SW 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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.9 2021-07-27
00:49:31
42.8015 13.0625 11 2021-07-27
00:58:45
Sala Sismica INGV-Roma 93256191
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-27 00:49:31 ± 0.04
Latitude 42.8015 ± 0.0018
Longitude 13.0625 ± 0.0037
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 93256191

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 290
Semi-minor axis of confidence ellipse (meter) 199
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 97
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) 101
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.04946
Epicentral distance of station farthest from the epicenter (degree) 0.43617
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 19
Type of magnitude ML
Reference to an origin 93256191
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-27 00:58:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-07-27T00:49:43.16 0.3 undecidable manual S 20 0.3085 50 0.08 69
IV.CESI.HHZ. 2021-07-27T00:49:40.85 0.3 undecidable manual S 330 0.2338 50 -0.03 72
IV.FDMO.HHZ. 2021-07-27T00:49:40.81 0.3 undecidable manual S 4 0.2356 50 -0.12 72
IV.TERO.HHZ. 2021-07-27T00:49:40.16 0.3 undecidable manual P 114 0.4362 50 -0.17 69
IT.MTCL.HGN. 2021-07-27T00:49:39.52 0.6 undecidable manual S 347 0.1979 50 -0.29 47
IV.LNSS.HHZ. 2021-07-27T00:49:39.65 0.3 undecidable manual S 185 0.1988 50 -0.2 72
IV.MC2.EHZ. 2021-07-27T00:49:38.41 0.3 undecidable manual S 40 0.1439 124 0.35 69
IV.GAVE.EHZ. 2021-07-27T00:49:38.91 0.3 undecidable manual S 229 0.1646 120 0.16 71
IV.CSP1.EHZ. 2021-07-27T00:49:38.15 0.3 undecidable manual P 20 0.3085 50 0 71
IV.ARRO.EHZ. 2021-07-27T00:49:38.17 0.6 undecidable manual P 225 0.3112 50 -0.03 47
IV.SMA1.EHZ. 2021-07-27T00:49:37.29 0.3 undecidable manual P 130 0.2635 50 -0.09 72
IT.MTCL.HGN. 2021-07-27T00:49:36.04 0.3 undecidable manual P 347 0.1979 50 -0.21 71
IV.LNSS.HHZ. 2021-07-27T00:49:36.21 0.3 undecidable manual P 185 0.1988 50 -0.07 73
IV.CESI.HHZ. 2021-07-27T00:49:36.80 0.3 undecidable manual P 330 0.2338 50 -0.07 72
IV.FDMO.HHZ. 2021-07-27T00:49:36.83 0.3 undecidable manual P 4 0.2356 50 -0.07 72
IV.NRCA.HHZ. 2021-07-27T00:49:35.41 0.1 undecidable manual S 50 0.0495 153 -0.16 95
IV.MC2.EHZ. 2021-07-27T00:49:35.43 0.3 positive manual P 40 0.1439 124 0.18 71
IV.GAVE.EHZ. 2021-07-27T00:49:35.73 0.3 positive manual P 229 0.1646 120 0.08 72
IV.NRCA.HHZ. 2021-07-27T00:49:33.88 0.1 undecidable manual P 50 0.0495 153 0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.2 0.000245 0.08 AML other m 2021-07-27T00:49:35.61
IV.NRCA.HHN. ML:1.2 0.00024466115 0.16 AML other m 2021-07-27T00:49:35.57
IV.GAVE.EHN. ML:0.6 3.510766E-5 0.18 AML other m 2021-07-27T00:49:39.54
IV.LNSS.HHN. ML:0.8 3.773809E-5 0.18 AML other m 2021-07-27T00:49:40.41
IV.GAVE.EHE. ML:0.8 4.705470665E-5 0.14 AML other m 2021-07-27T00:49:39.21
IV.LNSS.HHE. ML:0.9 5.44E-5 0.4 AML other m 2021-07-27T00:49:40.17
IV.CESI.HHN. ML:0.6 2.165586E-5 0.12 AML other m 2021-07-27T00:49:41.04
IV.CESI.HHE. ML:0.4 1.3511515E-5 0.1 AML other m 2021-07-27T00:49:41.47
IV.FDMO.HHE. ML:0.6 2.5423975E-5 0.1 AML other m 2021-07-27T00:49:41.93
IV.FDMO.HHN. ML:0.6 2.6518065E-5 0.18 AML other m 2021-07-27T00:49:41.34
IV.NRCA.HNE. ML:1.1 0.0002056504 0.09 AML other m 2021-07-27T00:49:35.59
IV.NRCA.HNN. ML:1.2 0.00023753745 0.07 AML other m 2021-07-27T00:49:35.58
IV.GAVE.HNE. ML:1.1 9.0763055E-5 0.37 AML other m 2021-07-27T00:49:39.72
IV.CESI.HNE. ML:1.4 0.000149031955 3.91 AML other m 2021-07-27T00:49:48.69
IV.CESI.HNN. ML:1.6 0.0002406448 1.69 AML other m 2021-07-27T00:49:49.18
IV.SMA1.EHE. ML:0.6 1.8379595E-5 0.6 AML other m 2021-07-27T00:49:46.97
IV.SMA1.EHN. ML:0.5 1.705723E-5 0.26 AML other m 2021-07-27T00:49:45.04
IV.CSP1.EHE. ML:1 4.0392585E-5 0.78 AML other m 2021-07-27T00:49:50.19
IV.CSP1.EHN. ML:1.1 5.115261985E-5 1.38 AML other m 2021-07-27T00:49:54.09
IV.ARRO.EHE. ML:0.4 8.943488E-6 0.34 AML other m 2021-07-27T00:49:44.17
IV.TERO.HHE. ML:1.4 5.845999E-5 0.32 AML other m 2021-07-27T00:49:48.27
IV.TERO.HHN. ML:0.6 8.505035E-6 0.08 AML other m 2021-07-27T00:49:47.12
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