Earthquake with magnitude of ML 1.3 on date 18-01-2021 and time 19:04:36 (UTC) in region 3 km NE Massa Martana (PG)

A magnitude ML 1.3 earthquake occured in region: 3 km NE Massa Martana (PG), on

  • 18-01-2021 19:04:36 (UTC)
  • 18-01-2021 20:04:36 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8, 12.56 at 8 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
Massa Martana PG 3 3770 3770
Giano dell'Umbria PG 5 3846 7616
Castel Ritaldi PG 10 3278 10894
Acquasparta TR 12 4778 15672
Todi PG 12 16851 32523
Gualdo Cattaneo PG 13 6155 38678
Montefalco PG 14 5679 44357
Collazzone PG 15 3473 47830
Bevagna PG 16 5081 52911
Spoleto PG 16 38218 91129
Fratta Todina PG 17 1839 92968
Montecastrilli TR 17 5022 97990
Monte Castello di Vibio PG 17 1567 99557
Trevi PG 18 8469 108026
Campello sul Clitunno PG 18 2442 110468
Avigliano Umbro TR 19 2558 113026

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km SW of Foligno (57155 inhabitants)
27 Km N of Terni (111501 inhabitants)
37 Km SE of Perugia (166134 inhabitants)
56 Km NE of Viterbo (67173 inhabitants)
85 Km NW of L'Aquila (69753 inhabitants)
90 Km N of Guidonia Montecelio (88673 inhabitants)
92 Km SE of Arezzo (99543 inhabitants)
95 Km N of Tivoli (56533 inhabitants)
95 Km W of Teramo (54892 inhabitants)
100 Km NE of Civitavecchia (52991 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 1.3 2021-01-18
19:04:36
42.8 12.56 8 2021-01-18
19:11:23
Sala Sismica INGV-Roma 86358841
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-18 19:04:36 ± 0.09
Latitude 42.80 ± 0.01
Longitude 12.56 ± 0.01
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86358841

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 546
Semi-minor axis of confidence ellipse (meter) 517
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 283
Circular confidence region, given by single value of horizontal uncertainty (meter) 550
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 104
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 25
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.01259
Epicentral distance of station farthest from the epicenter (degree) 0.6655
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.1
Num. used stations 18
Type of magnitude ML
Reference to an origin 86358841
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-18 19:11:23
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.EL6.EHZ. 2021-01-18T19:05:00.91 0.3 undecidable manual S 37 0.6655 50 1.29 42
IV.SACS.HHZ. 2021-01-18T19:04:54.79 0.3 undecidable manual S 277 0.4766 50 0.77 56
IV.MC2.EHZ. 2021-01-18T19:04:54.84 0.6 undecidable manual S 76 0.4775 50 0.78 37
IV.FDMO.HHZ. 2021-01-18T19:04:53.30 0.3 undecidable manual S 58 0.4569 50 -0.15 68
IV.NRCA.HHZ. 2021-01-18T19:04:52.35 0.3 undecidable manual S 85 0.411 50 0.27 67
IV.LNSS.HHZ. 2021-01-18T19:04:51.86 0.6 undecidable manual S 118 0.4047 50 -0.04 47
IV.EL6.EHZ. 2021-01-18T19:04:50.12 0.1 undecidable manual P 37 0.6655 50 0.16 86
IV.MGAB.HHZ. 2021-01-18T19:04:49.94 0.3 undecidable manual S 290 0.3453 50 -0.19 69
IV.CESI.HHZ. 2021-01-18T19:04:49.36 0.3 undecidable manual S 51 0.3301 50 -0.31 67
IV.SMA1.EHZ. 2021-01-18T19:04:48.79 0.1 undecidable manual P 106 0.5963 50 0.01 90
IV.ASSB.HHZ. 2021-01-18T19:04:47.08 0.3 undecidable manual S 17 0.2572 106 0.01 73
IV.FDMO.HHZ. 2021-01-18T19:04:46.15 0.1 undecidable manual P 58 0.4569 50 -0.25 88
IV.MC2.EHZ. 2021-01-18T19:04:46.77 0.1 undecidable manual P 76 0.4775 50 0.02 92
IV.SACS.HHZ. 2021-01-18T19:04:46.57 0.1 undecidable manual P 277 0.4766 50 -0.16 90
IV.LNSS.HHZ. 2021-01-18T19:04:45.26 0.1 undecidable manual P 118 0.4047 50 -0.25 89
IV.ATCC.EHZ. 2021-01-18T19:04:45.09 0.1 undecidable manual P 9 0.393 50 -0.21 90
IV.NRCA.HHZ. 2021-01-18T19:04:45.39 0.1 undecidable manual P 85 0.411 50 -0.22 90
IV.MGAB.HHZ. 2021-01-18T19:04:44.19 0.1 undecidable manual P 290 0.3453 50 -0.3 90
IV.CESI.HHZ. 2021-01-18T19:04:44.03 0.1 undecidable manual P 51 0.3301 50 -0.19 92
IV.CESX.HHZ. 2021-01-18T19:04:44.90 0.3 undecidable manual S 173 0.1889 111 0.32 69
IV.ASSB.HHZ. 2021-01-18T19:04:42.70 0.1 undecidable manual P 17 0.2572 106 -0.02 97
IV.ARRO.EHZ. 2021-01-18T19:04:42.46 0.1 undecidable manual P 145 0.2662 105 -0.45 88
IV.CESX.HHZ. 2021-01-18T19:04:41.52 0.1 undecidable manual P 173 0.1889 111 0.24 93
IV.MOMA.HHZ. 2021-01-18T19:04:39.69 0.1 undecidable manual S 55 0.0126 170 0.08 100
IV.MOMA.HHZ. 2021-01-18T19:04:38.49 0.1 undecidable manual P 55 0.0126 170 0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESX.HHN. ML:1.4 0.000188 0.38 AML other m 2021-01-18T19:04:45.57
IV.CESX.HHE. ML:1.2 0.0001275 0.3 AML other m 2021-01-18T19:04:45.41
IV.ASSB.HHN. ML:1.2 8.245E-5 1.26 AML other m 2021-01-18T19:04:47.22
IV.ASSB.HHE. ML:1.2 7.815E-5 0.38 AML other m 2021-01-18T19:04:48.23
IV.ARRO.EHN. ML:1.2 7.475E-5 1 AML other m 2021-01-18T19:04:48.62
IV.ARRO.EHE. ML:1.3 9.565E-5 1.1 AML other m 2021-01-18T19:04:48.21
IV.CESI.HHN. ML:1.3 8.045E-5 0.22 AML other m 2021-01-18T19:04:49.75
IV.CESI.HHE. ML:1.2 5.705E-5 0.94 AML other m 2021-01-18T19:04:50.35
IV.MGAB.HHE. ML:1.4 9.36E-5 0.24 AML other m 2021-01-18T19:04:51.41
IV.MGAB.HHN. ML:1.5 0.000127 0.34 AML other m 2021-01-18T19:04:51.65
IV.LNSS.HHE. ML:1.5 0.00010085 0.3 AML other m 2021-01-18T19:04:52.76
IV.NRCA.HHE. ML:1.3 6.315E-5 0.26 AML other m 2021-01-18T19:04:53.32
IV.LNSS.HHN. ML:1.4 8.365E-5 0.6 AML other m 2021-01-18T19:04:53.42
IV.NRCA.HHN. ML:1.3 5.92E-5 0.94 AML other m 2021-01-18T19:04:53.45
IV.FDMO.HHE. ML:1.1 3.565E-5 1.14 AML other m 2021-01-18T19:04:54.71
IV.FDMO.HHN. ML:1.1 2.78E-5 1.54 AML other m 2021-01-18T19:04:55.08
IV.SMA1.EHE. ML:1.5 6.07E-5 1.7 AML other m 2021-01-18T19:04:59.94
IV.SMA1.EHN. ML:1.3 4.055E-5 0.34 AML other m 2021-01-18T19:05:04.80
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