Earthquake with magnitude of ML 1.6 on date 01-08-2020 and time 14:18:17 (Italy) in region Massa Martana (PG)

A magnitude ML 1.6 earthquake occured in region: Massa Martana (PG), on

  • 01-08-2020 12:18:17 (UTC)
  • 01-08-2020 14:18:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.78, 12.53 at 9 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 0 3770 3770
Giano dell'Umbria PG 8 3846 7616
Todi PG 10 16851 24467
Acquasparta TR 10 4778 29245
Castel Ritaldi PG 13 3278 32523
Montecastrilli TR 15 5022 37545
Collazzone PG 15 3473 41018
Gualdo Cattaneo PG 15 6155 47173
Avigliano Umbro TR 16 2558 49731
Monte Castello di Vibio PG 16 1567 51298
Fratta Todina PG 16 1839 53137
Montefalco PG 17 5679 58816
Spoleto PG 18 38218 97034
San Gemini TR 18 5018 102052
Bevagna PG 19 5081 107133

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km SW of Foligno (57155 inhabitants)
26 Km NW of Terni (111501 inhabitants)
38 Km SE of Perugia (166134 inhabitants)
53 Km NE of Viterbo (67173 inhabitants)
86 Km NW of L'Aquila (69753 inhabitants)
88 Km N of Guidonia Montecelio (88673 inhabitants)
93 Km SE of Arezzo (99543 inhabitants)
93 Km N of Tivoli (56533 inhabitants)
97 Km NE of Civitavecchia (52991 inhabitants)
97 Km W of Teramo (54892 inhabitants)
98 Km N of Roma (2864731 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 2020-08-01
12:18:17
42.78 12.53 9 2020-08-01
12:22:49
Sala Sismica INGV-Roma 81544951
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-01 12:18:17 ± 0.08
Latitude 42.78 ± 0.01
Longitude 12.53 ± 0.01
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 81544951

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 773
Semi-minor axis of confidence ellipse (meter) 594
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 71
Circular confidence region, given by single value of horizontal uncertainty (meter) 770
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 129
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.04047
Epicentral distance of station farthest from the epicenter (degree) 0.48384
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 81544951
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-01 12:22:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MGAB.HHZ. 2020-08-01T12:18:29.83 0.6 undecidable manual S 294 0.3318 50 0.03 47
IV.MURB.HHZ. 2020-08-01T12:18:27.44 0.6 undecidable manual P 360 0.4838 50 0.4 43
IV.CESX.HHZ. 2020-08-01T12:18:25.02 0.6 undecidable manual S 165 0.1754 116 0.42 45
IV.LNSS.HHZ. 2020-08-01T12:18:25.79 0.6 undecidable manual P 115 0.4164 50 -0.08 46
IV.MGAB.HHZ. 2020-08-01T12:18:24.19 0.6 undecidable manual P 294 0.3318 50 -0.24 45
IV.CESI.HHN. 2020-08-01T12:18:24.91 0.1 undecidable manual P 51 0.357 50 0.04 94
IV.GAVE.EHZ. 2020-08-01T12:18:23.41 0.6 undecidable manual P 108 0.2833 50 -0.19 46
IV.CESX.HHZ. 2020-08-01T12:18:21.06 0.6 positive manual P 165 0.1754 116 -0.38 46
IT.GNU.HGE. 2020-08-01T12:18:20.54 0.6 undecidable manual S 52 0.0405 154 -0.16 49
IV.MOMA.HHZ. 2020-08-01T12:18:20.64 0.6 undecidable manual S 51 0.0405 154 -0.06 50
IV.MOMA.HHZ. 2020-08-01T12:18:19.23 0.1 negative manual P 51 0.0405 154 0.05 100
IT.GNU.HGE. 2020-08-01T12:18:19.27 0.3 undecidable manual P 52 0.0405 154 0.09 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHE. ML:2 0.00191 0.26 AML other m 2020-08-01T12:18:21.06
IV.MOMA.HHN. ML:1.9 0.001485 1.24 AML other m 2020-08-01T12:18:21.08
IV.CESX.HHE. ML:1.4 0.0002155 0.22 AML other m 2020-08-01T12:18:26.53
IV.CESX.HHN. ML:1.4 0.000197 0.6 AML other m 2020-08-01T12:18:26.51
IV.ASSB.HHE. ML:0.9 3.905E-5 1.2 AML other m 2020-08-01T12:18:29.70
IV.GAVE.EHE. ML:1.5 0.0001395 0.66 AML other m 2020-08-01T12:18:29.57
IV.ASSB.HHN. ML:0.9 4.145E-5 0.18 AML other m 2020-08-01T12:18:29.92
IV.GAVE.EHN. ML:1.6 0.000181 0.36 AML other m 2020-08-01T12:18:30.19
IV.MGAB.HHN. ML:1.6 0.000168 0.34 AML other m 2020-08-01T12:18:30.29
IV.MGAB.HHE. ML:1.8 0.000235 0.56 AML other m 2020-08-01T12:18:30.61
IV.LNSS.HHN. ML:1.6 0.000116 0.2 AML other m 2020-08-01T12:18:34.32
IV.LNSS.HHE. ML:1.6 0.000108 0.66 AML other m 2020-08-01T12:18:34.46
IV.MURB.HHN. ML:1.8 0.0001415 1.64 AML other m 2020-08-01T12:18:37.07
IV.MURB.HHE. ML:1.8 0.000158 1.82 AML other m 2020-08-01T12:18:37.02
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