Earthquake with magnitude of ML 1.6 on date 02-02-2021 and time 02:44:36 (Italy) in region 4 km SW Montecastrilli (TR)

A magnitude ML 1.6 earthquake occured in region: 4 km SW Montecastrilli (TR), on

  • 02-02-2021 01:44:36 (UTC)
  • 02-02-2021 02:44:36 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.63, 12.46 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
Montecastrilli TR 4 5022 5022
Avigliano Umbro TR 4 2558 7580
San Gemini TR 7 5018 12598
Amelia TR 8 11897 24495
Acquasparta TR 10 4778 29273
Lugnano in Teverina TR 12 1494 30767
Narni TR 13 19785 50552
Guardea TR 13 1836 52388
Alviano TR 14 1463 53851
Montecchio TR 15 1676 55527
Giove TR 17 1928 57455
Penna in Teverina TR 17 1099 58554
Terni TR 17 111501 170055
Massa Martana PG 18 3770 173825
Todi PG 18 16851 190676
Attigliano TR 19 2028 192704
Orte VT 19 8923 201627

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km W of Terni (111501 inhabitants)
37 Km NE of Viterbo (67173 inhabitants)
42 Km SW of Foligno (57155 inhabitants)
54 Km S of Perugia (166134 inhabitants)
73 Km NW of Guidonia Montecelio (88673 inhabitants)
79 Km NW of Tivoli (56533 inhabitants)
81 Km NE of Civitavecchia (52991 inhabitants)
82 Km N of Roma (2864731 inhabitants)
83 Km W of L'Aquila (69753 inhabitants)
97 Km N of Fiumicino (78395 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 1.6 2021-02-02
01:44:36
42.63 12.46 8 2021-02-02
01:50:58
Sala Sismica INGV-Roma 86774701
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-02 01:44:36 ± 0.09
Latitude 42.63 ± 0.00
Longitude 12.46 ± 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 86774701

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 945
Semi-minor axis of confidence ellipse (meter) 327
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 63
Circular confidence region, given by single value of horizontal uncertainty (meter) 940
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 80
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.09623
Epicentral distance of station farthest from the epicenter (degree) 0.48384
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 86774701
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-02 01:50:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.SRES.HHZ. 2021-02-02T01:44:51.58 0.3 undecidable manual S 174 0.3912 50 -0.11 78
IV.ARRO.EHZ. 2021-02-02T01:44:46.40 0.3 undecidable manual S 102 0.2302 107 0.19 79
IV.BARO.HNN. 2021-02-02T01:44:46.85 0.6 undecidable manual P 219 0.4838 50 -0.17 50
IV.SACS.HHN. 2021-02-02T01:44:46.87 0.1 undecidable manual P 299 0.4605 50 0.24 100
IV.SRES.HHZ. 2021-02-02T01:44:45.30 1.0 positive manual P 174 0.3912 50 -0.15 26
IV.MGAB.HHZ. 2021-02-02T01:44:45.31 0.3 positive manual P 318 0.3822 50 0.01 80
IV.MOMA.HHZ. 2021-02-02T01:44:44.76 0.3 undecidable manual S 25 0.1952 110 -0.15 81
IV.ARRO.EHZ. 2021-02-02T01:44:42.29 0.3 undecidable manual P 102 0.2302 107 0 82
IV.MOMA.HHZ. 2021-02-02T01:44:41.41 0.6 positive manual P 25 0.1952 110 -0.12 54
IV.CESX.HHZ. 2021-02-02T01:44:41.53 0.3 undecidable manual S 101 0.0962 126 0.02 84
IV.CESX.HHZ. 2021-02-02T01:44:39.55 0.3 positive manual P 101 0.0962 126 -0.02 84
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESX.HHN. ML:2 0.0013 0.24 AML other m 2021-02-02T01:44:41.96
IV.CESX.HHE. ML:1.8 0.000924 1.68 AML other m 2021-02-02T01:44:41.98
IV.MOMA.HHN. ML:1.4 0.000194 1.06 AML other m 2021-02-02T01:44:46.38
IV.MOMA.HHE. ML:1.6 0.000264 0.42 AML other m 2021-02-02T01:44:47.29
IV.ARRO.EHN. ML:1.6 0.0002625 0.24 AML other m 2021-02-02T01:44:47.41
IV.ARRO.EHE. ML:1.4 0.00016 1.84 AML other m 2021-02-02T01:44:47.94
IV.MGAB.HHN. ML:1.4 8.635E-5 0.5 AML other m 2021-02-02T01:44:52.57
IV.MGAB.HHE. ML:1.7 0.0001535 0.22 AML other m 2021-02-02T01:44:53.58
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