Earthquake with magnitude of ML 1.0 on date 31-07-2020 and time 00:32:40 (Italy) in region 6 km NW Grassano (MT)

A magnitude ML 1.0 earthquake occured in region: 6 km NW Grassano (MT), on

  • 30-07-2020 22:32:40 (UTC)
  • 31-07-2020 00:32:40 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 40.67, 16.23 at 22 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
Grassano MT 6 5189 5189
Irsina MT 8 4960 10149
Tricarico MT 10 5388 15537
Calciano MT 10 777 16314
San Chirico Nuovo PZ 13 1368 17682
Garaguso MT 14 1073 18755
Grottole MT 14 2208 20963
Oliveto Lucano MT 16 450 21413
Campomaggiore PZ 18 811 22224
Salandra MT 18 2829 25053
Tolve PZ 19 3251 28304
Albano di Lucania PZ 19 1435 29739

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km W of Matera (60436 inhabitants)
32 Km SW of Altamura (70396 inhabitants)
36 Km E of Potenza (67122 inhabitants)
62 Km S of Andria (100440 inhabitants)
62 Km SW of Bitonto (55540 inhabitants)
67 Km SW of Molfetta (59874 inhabitants)
67 Km SW of Bisceglie (55422 inhabitants)
69 Km S of Trani (56217 inhabitants)
72 Km SE of Cerignola (58396 inhabitants)
72 Km S of Barletta (94814 inhabitants)
73 Km SW of Bari (326344 inhabitants)
87 Km W of Taranto (201100 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 1.0 2020-07-30
22:32:40
40.67 16.23 22 2020-07-30
22:38:47
Sala Sismica INGV-Roma 81498781
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-07-30 22:32:40 ± 0.2
Latitude 40.67 ± 0.01
Longitude 16.23 ± 0.01
Depth (km) 22 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 81498781

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 860
Semi-minor axis of confidence ellipse (meter) 646
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 333
Circular confidence region, given by single value of horizontal uncertainty (meter) 860
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 100
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.63852
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 81498781
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-07-30 22:38:47
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.IST3.HHZ. 2020-07-30T22:33:41.82 3.0 undecidable manual Sg 2.87 0
XK.GIZZ.HHZ. 2020-07-30T22:33:29.13 3.0 undecidable manual Sn -1.58 0
IV.MCEL.HHZ. 2020-07-30T22:32:57.92 0.3 undecidable manual S 223 0.4793 105 -0.09 95
IV.NOCI.HHZ. 2020-07-30T22:32:54.07 0.3 negative manual P 79 0.6385 101 0.61 80
IV.AMUR.HHZ. 2020-07-30T22:32:54.39 0.3 undecidable manual S 50 0.3642 111 -0.37 89
IV.PALZ.HHZ. 2020-07-30T22:32:54.33 0.3 undecidable manual S 323 0.3408 113 0.21 94
GE.MATE.HHZ. 2020-07-30T22:32:54.40 0.3 undecidable manual S 94 0.357 112 -0.17 93
IV.MCEL.HHZ. 2020-07-30T22:32:50.45 0.3 undecidable manual P 223 0.4793 105 -0.34 90
IV.MIGL.HHZ. 2020-07-30T22:32:50.38 0.3 undecidable manual S 114 0.1718 134 0.51 92
IV.PTRP.HHZ. 2020-07-30T22:32:50.12 0.3 undecidable manual S 221 0.2014 129 -0.42 94
IV.CRAC.EHZ. 2020-07-30T22:32:48.63 0.6 positive manual P 152 0.3292 114 0.25 62
IV.AMUR.HHZ. 2020-07-30T22:32:48.77 0.3 undecidable manual P 50 0.3642 111 -0.15 94
IV.PALZ.HHZ. 2020-07-30T22:32:48.50 0.3 positive manual P 323 0.3408 113 -0.05 97
GE.MATE.HHZ. 2020-07-30T22:32:48.58 0.6 undecidable manual P 94 0.357 112 -0.23 62
IV.MIGL.HHZ. 2020-07-30T22:32:46.04 0.3 undecidable manual P 114 0.1718 134 -0.06 100
IV.PTRP.HHZ. 2020-07-30T22:32:46.93 0.3 undecidable manual P 221 0.2014 129 0.44 91
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PTRP.HHN. ML:1 4.6E-5 0.48 AML other m 2020-07-30T22:32:53.00
IV.PTRP.HHE. ML:0.9 3.285E-5 0.58 AML other m 2020-07-30T22:32:53.82
GE.MATE.HHE. ML:1 3.045E-5 1.16 AML other m 2020-07-30T22:32:55.15
IV.AMUR.HHE. ML:0.8 2.005E-5 1.22 AML other m 2020-07-30T22:32:55.18
GE.MATE.HHN. ML:1 2.97E-5 0.32 AML other m 2020-07-30T22:32:55.38
IV.AMUR.HHN. ML:0.8 1.875E-5 1.16 AML other m 2020-07-30T22:32:55.86
IV.CRAC.EHN. ML:1 3.35E-5 0.86 AML other m 2020-07-30T22:32:55.99
IV.CRAC.EHE. ML:1 3.625E-5 0.16 AML other m 2020-07-30T22:32:58.27
IV.MCEL.HHN. ML:0.8 1.67E-5 0.74 AML other m 2020-07-30T22:32:59.48
IV.MCEL.HHE. ML:1 1.78E-5 0.24 AML other m 2020-07-30T22:33:01.37
IV.NOCI.HHE. ML:1.4 4.075E-5 0.52 AML other m 2020-07-30T22:33:04.77
IV.NOCI.HHN. ML:1.4 3.815E-5 0.2 AML other m 2020-07-30T22:33:04.65
IV.IST3.HHN. ML:4.2 0.004165 0.82 AML other m 2020-07-30T22:33:44.25
IV.IST3.HHE. ML:3.9 0.00201 0.82 AML other m 2020-07-30T22:33:44.66
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