Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.1 on date 07-11-1987 and time 14:12:12 (UTC) in region 7 km SE Ponte Buggianese (PT)

A magnitude Md 2.1 earthquake occured in region: 7 km SE Ponte Buggianese (PT), on

  • 07-11-1987 14:12:12 (UTC)
  • 07-11-1987 15:12:12 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.7920, 10.7970 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Ponte Buggianese PT 7 8804 8804
Fucecchio FI 7 23618 32422
Cerreto Guidi FI 7 10870 43292
Larciano PT 8 6394 49686
Chiesina Uzzanese PT 8 4552 54238
Lamporecchio PT 9 7508 61746
Santa Croce sull'Arno PI 9 14601 76347
Monsummano Terme PT 9 21338 97685
Pieve a Nievole PT 10 9266 106951
Altopascio LU 10 15481 122432
Montecatini-Terme PT 11 20409 142841
Vinci FI 11 14604 157445
Castelfranco di Sotto PI 11 13427 170872
Buggiano PT 11 8825 179697
Montecarlo LU 12 4428 184125
Uzzano PT 12 5770 189895
Serravalle Pistoiese PT 13 11659 201554
San Miniato PI 13 27934 229488
Santa Maria a Monte PI 13 13253 242741
Massa e Cozzile PT 14 7983 250724
Montopoli in Val d'Arno PI 14 11148 261872
Empoli FI 15 48109 309981
Pescia PT 15 19644 329625
Porcari LU 15 8845 338470
Capraia e Limite FI 16 7670 346140
Quarrata PT 16 26190 372330
Marliana PT 16 3210 375540
Bientina PI 17 8062 383602
Carmignano PO 18 14450 398052
Buti PI 18 5791 403843
Pistoia PT 19 90315 494158
Calcinaia PI 19 12439 506597
Capannori LU 19 46252 552849
Pontedera PI 19 29223 582072
Montelupo Fiorentino FI 19 14098 596170
Villa Basilica LU 19 1633 597803
Vicopisano PI 20 8559 606362

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km SW of Pistoia (90315 inhabitants)
24 Km E of Lucca (89046 inhabitants)
26 Km W of Prato (191150 inhabitants)
31 Km W of Scandicci (50609 inhabitants)
33 Km E of Pisa (89158 inhabitants)
37 Km W of Firenze (382808 inhabitants)
45 Km E of Viareggio (62467 inhabitants)
47 Km NE of Livorno (159219 inhabitants)
59 Km E of Massa (69479 inhabitants)
64 Km E of Carrara (63133 inhabitants)
68 Km NW of Siena (53903 inhabitants)
85 Km E of La Spezia (93959 inhabitants)
90 Km SW of Bologna (386663 inhabitants)
95 Km W of Arezzo (99543 inhabitants)
96 Km S of Modena (184973 inhabitants)
96 Km SW of Imola (69797 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		Md 2.1
ML-VAX 1.5 		1987-11-07
14:12:12		 43.792 10.797 10 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 58199
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-11-07 14:12:12 ± 0.186
Latitude 43.7920 ± 0.0123
Longitude 10.7970 ± 0.0116
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 58199

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 1658.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 167
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
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) 0.00186
Epicentral distance of station farthest from the epicenter (degree) 0.00688
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitudes information

Md:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 58199
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:55:43

ML:1.5

Field Value
Value 1.5
Uncertainty
Num. used stations 3
Type of magnitude ML
Reference to an origin 58199
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.SS9.Z. 1987-11-07T14:12:38.92 10.0 undecidable manual SG 79 0.7659 -0.28 0.5
--.PGD.Z. 1987-11-07T14:12:35.75 10.0 undecidable manual SG 82 0.666 -0.25 0.6
--.SS9.Z. 1987-11-07T14:12:29.46 10.0 undecidable manual PG 79 0.7659 1.54 0
--.MME.Z. 1987-11-07T14:12:27.77 10.0 undecidable manual SG 350 0.3996 0.25 0.7
--.PGD.Z. 1987-11-07T14:12:26.31 10.0 undecidable manual PG 82 0.666 0.23 1.6
--.PII.Z. 1987-11-07T14:12:20.41 10.0 undecidable manual SG 250 0.2109 -0.74 0.1
--.MME.Z. 1987-11-07T14:12:20.98 10.0 undecidable manual PG 350 0.3996 -0.2 1.9
--.PII.Z. 1987-11-07T14:12:17.87 10.0 undecidable manual PG 250 0.2109 0.37 1.2
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download