Earthquake with magnitude of ML 1.1 on date 28-07-2020 and time 18:20:50 (Italy) in region 4 km W Norcia (PG)

A magnitude ML 1.1 earthquake occured in region: 4 km W Norcia (PG), on

  • 28-07-2020 16:20:50 (UTC)
  • 28-07-2020 18:20:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8, 13.05 at 12 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 4 4957 4957
Cascia PG 9 3217 8174
Preci PG 9 724 8898
Cerreto di Spoleto PG 11 1075 9973
Poggiodomo PG 13 117 10090
Castelsantangelo sul Nera MC 14 281 10371
Sellano PG 14 1079 11450
Vallo di Nera PG 15 364 11814
Visso MC 15 1107 12921
Monteleone di Spoleto PG 18 599 13520
Ussita MC 18 444 13964
Sant'Anatolia di Narco PG 18 564 14528
Scheggino PG 20 461 14989
Accumoli RI 20 667 15656

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km SE of Foligno (57155 inhabitants)
42 Km NE of Terni (111501 inhabitants)
56 Km W of Teramo (54892 inhabitants)
57 Km NW of L'Aquila (69753 inhabitants)
64 Km SE of Perugia (166134 inhabitants)
88 Km E of Viterbo (67173 inhabitants)
92 Km N of Guidonia Montecelio (88673 inhabitants)
95 Km N of Tivoli (56533 inhabitants)
96 Km W of Montesilvano (53738 inhabitants)
99 Km SW of Ancona (100861 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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 1.1 2020-07-28
16:20:50
42.8 13.05 12 2020-07-28
16:30:04
Sala Sismica INGV-Roma 81426491
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-07-28 16:20:50 ± 0.05
Latitude 42.80 ± 0.00
Longitude 13.05 ± 0.00
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 81426491

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 379
Semi-minor axis of confidence ellipse (meter) 133
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 103
Circular confidence region, given by single value of horizontal uncertainty (meter) 380
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 107
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.44516
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 12
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 11
Type of magnitude ML
Reference to an origin 81426491
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-07-28 16:30:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ZCCA.HHZ. 2020-07-28T16:21:55.37 3.0 undecidable manual Sn -0.8 0
IV.FIR.HHZ. 2020-07-28T16:21:44.09 3.0 undecidable manual Sg 0.81 0
IV.VIVA.HHZ. 2020-07-28T16:21:26.60 3.0 undecidable manual S -2.41 0
IV.RONT.HHZ. 2020-07-28T16:21:22.34 3.0 undecidable manual Pg 1.58 0
IV.TERO.HHZ. 2020-07-28T16:21:06.04 0.3 undecidable manual S 113 0.4452 91 0.22 69
IV.VCEL.EHZ. 2020-07-28T16:21:05.13 3.0 undecidable manual P -0.07 0
IV.CSP1.EHZ. 2020-07-28T16:21:02.22 0.6 undecidable manual S 21 0.3175 91 0.19 47
IV.SMA1.EHZ. 2020-07-28T16:21:01.26 0.6 undecidable manual S 128 0.2698 91 0.64 43
IV.RM33.EHZ. 2020-07-28T16:21:01.76 0.6 undecidable manual S 157 0.313 91 -0.14 47
IV.MMO1.EHZ. 2020-07-28T16:20:59.11 0.3 undecidable manual S 63 0.2302 92 -0.34 69
IV.FDMO.HHZ. 2020-07-28T16:20:59.69 0.3 undecidable manual S 7 0.2419 92 -0.1 73
IV.TERO.HHZ. 2020-07-28T16:20:59.16 0.3 undecidable manual P 113 0.4452 91 -0.05 71
IV.CESI.HNE. 2020-07-28T16:20:59.57 0.6 undecidable manual S 334 0.2329 92 0.04 49
IT.MTCL.HGZ. 2020-07-28T16:20:58.44 0.3 undecidable manual S 350 0.2005 92 -0.13 74
IV.LNSS.HHZ. 2020-07-28T16:20:58.09 0.3 undecidable manual S 181 0.1934 93 -0.28 71
IV.GAVE.EHZ. 2020-07-28T16:20:57.01 0.3 undecidable manual S 227 0.1529 96 -0.15 75
IV.CSP1.EHZ. 2020-07-28T16:20:57.03 0.3 undecidable manual P 21 0.3175 91 0.01 73
IV.MC2.EHZ. 2020-07-28T16:20:57.15 0.3 undecidable manual S 42 0.1556 95 -0.09 74
IV.FEMA.HNZ. 2020-07-28T16:20:57.58 0.3 undecidable manual S 1 0.1655 94 0.04 75
IV.RM33.EHZ. 2020-07-28T16:20:56.83 0.3 undecidable manual P 157 0.313 91 -0.12 72
IV.SMA1.EHZ. 2020-07-28T16:20:56.56 1.0 negative manual P 128 0.2698 91 0.35 23
IV.CESI.HNE. 2020-07-28T16:20:55.66 0.3 undecidable manual P 334 0.2329 92 0.09 73
IV.MMO1.EHZ. 2020-07-28T16:20:55.41 0.1 undecidable manual P 63 0.2302 92 -0.12 97
IV.FDMO.HHZ. 2020-07-28T16:20:55.73 0.1 undecidable manual P 7 0.2419 92 0 99
IV.LNSS.HHZ. 2020-07-28T16:20:54.91 0.1 undecidable manual P 181 0.1934 93 0 100
IV.FEMA.HNZ. 2020-07-28T16:20:54.65 0.3 undecidable manual P 1 0.1655 94 0.22 72
IT.MTCL.HGZ. 2020-07-28T16:20:54.98 0.3 undecidable manual P 350 0.2005 92 -0.04 75
IV.GAVE.EHZ. 2020-07-28T16:20:54.29 0.1 undecidable manual P 227 0.1529 96 0.08 99
IV.MC2.EHZ. 2020-07-28T16:20:54.38 0.1 undecidable manual P 42 0.1556 95 0.12 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHN. ML:1.4 0.0002115 0.76 AML other m 2020-07-28T16:20:57.07
IV.GAVE.EHE. ML:1.6 0.000314 0.14 AML other m 2020-07-28T16:20:57.49
IV.LNSS.HHE. ML:1.3 0.000134 0.76 AML other m 2020-07-28T16:20:58.59
IV.LNSS.HHN. ML:1.3 0.000118 0.84 AML other m 2020-07-28T16:20:59.54
IV.FDMO.HHE. ML:1 5.66E-5 0.22 AML other m 2020-07-28T16:21:00.20
IV.FDMO.HHN. ML:1 6.155E-5 0.44 AML other m 2020-07-28T16:21:00.23
IV.SMA1.EHN. ML:0.9 3.685E-5 1.68 AML other m 2020-07-28T16:21:01.94
IV.SMA1.EHE. ML:1 4.385E-5 0.26 AML other m 2020-07-28T16:21:04.37
IV.GAVE.HNE. ML:1.6 0.0003210729 0.1408 AML other m 2020-07-28T16:20:57.41
IV.RM33.EHE. ML:0.8 2.557806E-5 1.3952 AML other m 2020-07-28T16:21:03.24
IV.RM33.EHN. ML:0.7 1.9260165E-5 1.5616 AML other m 2020-07-28T16:21:04.20
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download