INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 1.3 on date 16-05-2018 and time 00:26:41 (Italy) in region 2 km NE Massa Martana (PG)

A magnitude ML 1.3 earthquake occured in region: 2 km NE Massa Martana (PG), on

  • 15-05-2018 22:26:41 (UTC)
  • 16-05-2018 00:26:41 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.79, 12.54 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 2 3770 3770
Giano dell'Umbria PG 6 3846 7616
Acquasparta TR 11 4778 12394
Todi PG 11 16851 29245
Castel Ritaldi PG 12 3278 32523
Gualdo Cattaneo PG 14 6155 38678
Collazzone PG 15 3473 42151
Montefalco PG 15 5679 47830
Montecastrilli TR 16 5022 52852
Fratta Todina PG 16 1839 54691
Monte Castello di Vibio PG 16 1567 56258
Bevagna PG 17 5081 61339
Spoleto PG 17 38218 99557
Avigliano Umbro TR 17 2558 102115
San Gemini TR 19 5018 107133
Trevi PG 20 8469 115602
Campello sul Clitunno PG 20 2442 118044

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km SW of Foligno (57155 inhabitants)
27 Km NW of Terni (111501 inhabitants)
38 Km SE of Perugia (166134 inhabitants)
55 Km NE of Viterbo (67173 inhabitants)
85 Km NW of L'Aquila (69753 inhabitants)
89 Km N of Guidonia Montecelio (88673 inhabitants)
93 Km SE of Arezzo (99543 inhabitants)
94 Km N of Tivoli (56533 inhabitants)
96 Km W of Teramo (54892 inhabitants)
99 Km NE of Civitavecchia (52991 inhabitants)
100 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
Rev 100 ML 1.3 2018-05-15
22:26:41
42.79 12.54 8 2018-05-15
22:34:38
Sala Sismica INGV-Roma 56905731
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-05-15 22:26:41 ± 0.14
Latitude 42.79 ± 0.00
Longitude 12.54 ± 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 56905731

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1007
Semi-minor axis of confidence ellipse (meter) 281
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 98
Circular confidence region, given by single value of horizontal uncertainty (meter) 1010
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 173
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.47394
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 56905731
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-05-15 22:34:38
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ASSB.HHZ. 2018-05-15T22:26:51.44 0.1 undecidable manual S 19 0.268 104 -0.25 91
IV.MURB.HHZ. 2018-05-15T22:26:51.00 0.6 negative manual P 359 0.4739 50 0 46
IV.MGAB.HHZ. 2018-05-15T22:26:50.04 3.0 undecidable manual P 0
IV.ATTE.HHN. 2018-05-15T22:26:50.75 0.6 undecidable manual P 342 0.4317 50 0.48 42
IV.T1221.EHZ. 2018-05-15T22:26:50.80 0.1 undecidable manual S 72 0.2356 106 0.33 90
IV.ATCC.EHE. 2018-05-15T22:26:50.24 0.3 undecidable manual P 10 0.4029 50 0.47 63
IV.NRCA.HHZ. 2018-05-15T22:26:49.74 0.3 negative manual P 84 0.4227 50 -0.37 64
IV.CESX.HHZ. 2018-05-15T22:26:48.40 0.1 undecidable manual S 169 0.1826 111 -0.15 94
IV.CESI.HHZ. 2018-05-15T22:26:48.44 0.3 undecidable manual P 51 0.3426 50 -0.31 66
IV.T1221.EHZ. 2018-05-15T22:26:46.50 0.1 undecidable manual P 72 0.2356 106 0.03 96
IV.ASSB.HHZ. 2018-05-15T22:26:46.84 0.3 positive manual P 19 0.268 104 -0.34 67
IV.CESX.HHZ. 2018-05-15T22:26:45.52 0.3 undecidable manual P 169 0.1826 111 0.15 71
IV.MOMA.HHZ. 2018-05-15T22:26:43.85 0.1 undecidable manual S 54 0.0261 159 0 100
IV.MOMA.HHZ. 2018-05-15T22:26:42.75 0.1 undecidable manual P 54 0.0261 159 0.09 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESX.HHN. ML:1.1 9.09E-5 0.2 AML other m 2018-05-15T22:26:49.99
IV.CESX.HHE. ML:1.2 0.00010945 0.28 AML other m 2018-05-15T22:26:50.15
IV.NRCA.HHE. ML:1.2 5.105E-5 1.2 AML other m 2018-05-15T22:26:58.01
IV.MURB.HHE. ML:1.5 7.47E-5 0.28 AML other m 2018-05-15T22:26:59.03
IV.NRCA.HHN. ML:1.2 3.865E-5 1.16 AML other m 2018-05-15T22:27:00.63
IV.MURB.HHN. ML:1.5 7.985E-5 0.42 AML other m 2018-05-15T22:27:01.87
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